Can watching a movie with a stranger online actually make you friends?

Science · by Simone Rainieri · 7 min read read

Yes, within limits: watching a movie in sync with a stranger can genuinely build a sense of connection, and the effect has been measured rather than assumed. Two people reacting to the same scenes at the same moments show physiological synchrony that predicts how connected they report feeling afterward, and the effect does not depend on already knowing each other. On its face, watching a movie with a stranger over an app sounds like a novelty feature, something to fill a slow news week in a product roadmap. The psychology underneath it is more substantial than that framing suggests, and it has been studied directly, from multiple angles, in ways worth separating out one at a time.

What the research on synchronized shared experience shows

A 2023 study published in Communications Biology looked at pairs of people jointly watching a television show and measured facial expression synchrony and electrodermal activity, essentially skin-conductance signals tied to emotional arousal, while they watched (nature.com/articles/s42003-023-05461-2). The degree of synchronization between the two viewers predicted how socially connected they reported feeling to each other afterward. In other words, two people reacting to the same beats at the same moments, even without talking, produces a measurable bonding signal, not just a subjective sense of having shared something.

The short version, stated plainly: in the 2023 Communications Biology study, the more two viewers' facial expressions and skin-conductance responses synchronized while watching a show together, the more socially connected they reported feeling afterward. Follow-up work in Royal Society Open Science found that emotionally intense content strengthens this bonding effect more than neutral content does. Neither finding required the viewers to know each other beforehand.

What emotional intensity adds to the picture

Follow-up research published in Royal Society Open Science dug further into what specifically drives that effect, examining emotional intensity and emotional synchrony together with joint attention, the shared act of both people focusing on the same thing at the same time. The finding that stands out: it is not simply watching together that matters, it is watching something emotionally charged together, since higher emotional intensity in the shared content strengthened the bonding effect more than neutral content did. That has a direct, practical implication for anyone actually trying to use co-watching to get to know a stranger: a flat, low-stakes documentary is a weaker bonding tool than something with real emotional peaks, tension, comedy, a twist, because the mechanism runs on shared emotional reaction, not just shared screen time.

The physiological mechanism, and why it does not require familiarity

Some of this research points to neuropeptide activity, including a possible role for endorphins, during synchronized group activities, the same broad category of chemistry implicated in bonding from things like group dancing, choir singing, and rowing in unison. Separately, neuroscience research on joint attention during live person-to-person contact has found that shared focus on the same external thing activates the right temporoparietal junction, a brain region tied to social cognition, including a specific sub-component associated with spontaneous eye contact (ncbi.nlm.nih.gov/pmc/articles/PMC7283505). What is notable across this body of work is that the effect does not appear to depend on the two people already knowing each other. Joint attention is defined broadly enough to include something as simple as spectators at a stadium all watching the same play unfold together. Watching something together in real time sits in that same family of synchronized activity, just with a screen instead of a shared physical motion or a shared physical room.

Not the same thing as a parasocial relationship

It is worth drawing a clear line here, because the concepts get confused. A parasocial relationship is what happens when someone invests time and attention into a media figure, a streamer, a celebrity, a fictional character, who does not and cannot reciprocate. That is a one-directional phenomenon, and it is a different mechanism entirely from what the co-viewing and joint-attention research describes. Two strangers watching the same film together, reacting in real time to the same moments, is a mutual, reciprocal act: both people are generating the synchrony signal together, and both are, in principle, capable of noticing and responding to the other's reaction. It resembles co-viewing research far more than parasocial research, and conflating the two understates what is actually happening when two real people share synchronized attention.

Why it might matter more for strangers than for existing friends

Existing friends already have a shared history to fall back on when conversation lags. Two strangers do not, and the early stage of any new connection lives or dies on whether there is enough shared material to keep talking through the [awkward gaps](/journal/why-making-friends-as-an-adult-feels-so-awkward). A synced movie or show gives two people that material in real time, without either person having to manufacture it. You are not making small talk about the weather, you are both reacting to the same plot twist thirty seconds after it happens, which is a much lower-effort, higher-signal way to find out whether you actually get along with someone's sense of humor or taste. Co-viewing itself is not a new phenomenon, researchers have long noted that simultaneous media consumption, since the earliest days of television, encourages communication and engagement precisely because it gives people a shared reference point to react to together. What is new is doing it synchronously at a distance, with a stranger, rather than on a couch with someone you already know.

How Vairi uses this mechanism specifically

That is the specific mechanic behind Vairi's synced co-watching feature: two matched people can watch video or film together inside the chat with playback synchronized, alongside synced music listening, prompt games, and voice or video calls. It is one deliberately chosen tool among several, not a gimmick bolted onto a matching app, built on the same synchronized-shared-experience mechanism the research above describes. The Netflix Party phenomenon, later rebranded as Teleparty, showed there was already broad appetite for this kind of synced watching among people who already knew each other. The open question the research actually speaks to is whether the same synchrony effect holds between strangers, and the physiological literature on joint attention and emotional synchrony suggests there is no obvious reason it should not, since the mechanism does not appear to depend on prior familiarity, only on the shared, synchronized attention itself.

The honest caveat

None of this guarantees two strangers who watch the same film will become friends. Synchrony predicts a feeling of connection in a lab setting measuring facial expressions and skin conductance during a shared viewing session, not a durable friendship weeks later. But it is a real, replicated psychological mechanism, not a wellness-brand talking point, and it gives two people something dating-app small talk conspicuously lacks: an actual shared experience, ideally an emotionally charged one, happening in real time, before either of them has said much of anything at all.

A practical scenario of how this actually plays out

Picture two people who matched on a [friendship app](/journal/do-friendship-apps-actually-work) two days ago. They have exchanged maybe fifteen messages, enough to know each other's job and hometown but not much else. Rather than trying to force another round of biographical small talk, they decide to watch something together with playback synced. Twenty minutes in, something happens on screen, a plot twist, an unexpectedly funny line, a tense moment, and both react within a second or two of each other in the chat. That single synchronized reaction does more compatibility work than the previous fifteen messages combined, because per the Communications Biology findings, it is the degree of synchrony itself, not the content of anything either person says, that predicts felt connection. By the end of the film, they have a specific shared reference, this scene, this line, that neither of them had to manufacture, and that reference becomes something to build the next conversation around instead of starting from zero again.

Why content choice matters more than people expect

Given the Royal Society Open Science finding that emotional intensity strengthens the bonding effect, the choice of what to watch is not a trivial detail. A low-key, low-stakes choice, background-friendly content with few emotional peaks, produces less synchrony to react to and therefore a weaker version of the effect. Content with real tension, comedy, or emotional stakes gives two people more moments where a genuine, unscripted reaction is likely, and each of those moments is doing measurable relationship-building work, not just filling time. This is a small, practical point but it follows directly from the research rather than being a stylistic preference: for a first co-watching session with someone new, picking something emotionally flat because it feels like a safe, neutral choice is probably working against the exact mechanism that makes the activity useful in the first place.

What this does not replace

None of this argues that co-watching should replace actual conversation. The research describes a bonding mechanism that operates alongside verbal communication, not instead of it, and a friendship that consisted entirely of synchronized watching with no direct conversation would be missing most of what the [online-to-offline friendship literature](/journal/how-to-make-friends-online-and-take-it-offline) identifies as necessary for a relationship to deepen. The honest framing is additive: synchronized shared attention lowers the barrier to a first real connection and gives two people material to talk about, but the talking still has to happen, and a co-watching feature that became a substitute for it rather than a supplement to it would be solving the wrong problem.

Key takeaways

Physiological synchrony between two viewers, measured through facial expressions and skin conductance in the 2023 Communications Biology study, predicted how connected they felt afterward. Emotionally intense content strengthens the effect, per the Royal Society Open Science follow-up, so what you pick to watch matters. The mechanism does not require prior familiarity, which is exactly why it suits strangers better than small talk does. It builds a first feeling of connection, not a finished friendship: the conversation still has to carry it from there.

Common questions

Is it weird to watch a movie online with someone you have never met? No more than any other structured first activity, and arguably less awkward than a video call with nothing to talk about, since the film carries the interaction. If the broader worry is about apps in general, we have written separately about whether [using an app to make friends is weird](/journal/is-it-weird-to-use-an-app-to-make-friends). Most of the discomfort fades within the first twenty minutes of the session.

What should you watch with someone you just met? Something with real emotional peaks: comedy, tension, a twist. The Royal Society Open Science research found emotionally intense content produces a stronger bonding effect than neutral content, so a flat documentary chosen for safety is working against the mechanism.

Do you have to talk during the film? No. The synchrony effect in the research operated even without conversation, since it is driven by shared reactions rather than dialogue. A few live reactions in the chat are enough, and the film gives you plenty to discuss afterward.

Can co-watching alone turn into a real friendship? Not by itself. It lowers the barrier to a first connection and generates shared references, but friendships deepen through actual conversation over time, so treat a synced watch as a starting point rather than the whole plan.

Sources

[Cheong, Molani, Sadhukha & Chang, 2023, Synchronized affect in shared experiences strengthens social connection, Communications Biology](https://www.nature.com/articles/s42003-023-05461-2), the study showing facial-expression and skin-conductance synchrony between co-viewers predicted felt connection. [Chung, Mennella, Pacherie & Grezes, 2024, Social bonding through shared experiences: the role of emotional intensity, Royal Society Open Science](https://royalsocietypublishing.org/doi/10.1098/rsos.240048), the follow-up showing emotionally intense content strengthens bonding under joint attention. [Neuroscience research on joint attention and the right temporoparietal junction, via NIH PMC](https://pmc.ncbi.nlm.nih.gov/articles/PMC7283505).

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