Replying to newcomers enhances engagement with existing users: evidence from the reply network of a social virtual reality (VR) community

Imagine the internet as a massive, bustling digital town square. In this square, people gather in groups to chat, share jokes, and hang out. Sometimes, a huge crowd of new people rushes in all at once—maybe because a famous celebrity mentioned the town, or a viral video made it cool to visit. This is what scientists call a "surge of newcomers."

For the people who were already living in this town square (the "existing users"), this sudden flood can feel overwhelming. It's like walking into a party where you know everyone, and suddenly 500 strangers burst through the door. You might worry: Do I have to stop talking to my best friends to help the new people find their way? Will I get so busy greeting the crowd that I forget my old pals? This is the core question of a field called online community dynamics. Researchers want to know if growing a community helps everyone get along better, or if it causes stress that pushes old friends apart. The answer matters because if old friends stop talking to each other, the whole community might lose its special "vibe" and fall apart, even if it has more people.

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The Great VRChat Party Rush

Now, let's zoom in on a specific, very real digital town square: a Japanese-speaking community of people who love VRChat. VRChat is a place where you hang out as avatars in virtual reality, but the "town square" where they talk about it is actually on X (formerly Twitter).

In the summer of 2024, something exciting happened. A popular Japanese streamer named Sutanmi posted a video about VRChat. Suddenly, in August and September, thousands of new people started posting a specific hashtag that translates to "I started VRChat!" It was a massive wave of newcomers.

Two researchers, Kotaro Hayashi and Takuma Tanaka, decided to investigate what happened to the "old-timers" during this rush. They wanted to solve a mystery: When an existing user stops to say "Welcome!" to a new person, do they stop talking to their old friends?

They had two competing theories in their back pocket:

1. The "Crowding-Out" Theory: This is the "I'm too busy" idea. It suggests that because everyone only has so much time and attention, saying hello to a new person means you must stop talking to your old friends. It's like having a limited amount of pizza; if you give a slice to a new guest, you have less for your regulars.
2. The "Activation" Theory: This is the "I'm in a good mood" idea. It suggests that greeting a new person makes you feel energized and social. You don't stop talking to your old friends; instead, you start talking to everyone more. It's like finding a new song you love; you don't stop listening to your favorite old songs, you just play more music overall.

The Investigation: Tracking the Digital Footprints

To figure out which theory was right, the researchers played detective with digital footprints. They didn't just guess; they looked at actual data from X.

First, they identified the "Old-Timers": These were people who had announced they started VRChat way back in January or February 2024.
Next, they identified the "Newcomers": These were the people who posted that "I started VRChat" hashtag in August or September 2024.
Then, they found the "Early Partners": For every Old-Timer, the researchers looked at who they had been chatting with before the big rush (between February and April). These were their regular friends.

The researchers split the Old-Timers into two groups:

• The "Greeters" (Treated): People who actually replied to at least one Newcomer during the rush.
• The "Non-Greeters" (Controls): People who saw the rush but didn't reply to any Newcomers.

Then, they watched what happened after the rush. Did the "Greeters" talk less to their "Early Partners"? Or did they talk more?

The Big Reveal: The Party Got Bigger, Not Smaller

The results were a happy surprise for the "Activation" theory.

The data showed that when the "Greeters" replied to newcomers, they didn't abandon their old friends. In fact, they became more active overall.

Here is exactly what the numbers told us:

• More Posts: The "Greeters" posted 0.59 more posts (on a special log scale) than the "Non-Greeters" after the rush.
• More Replies: They sent 0.69 more replies in total.
• More Time for Old Friends: Crucially, they sent 0.30 more replies specifically to their "Early Partners."

Think of it this way: Instead of the "Greeters" taking a slice of pizza away from their friends to give to the new guests, they seemed to order a whole new pizza. They found a way to welcome the new people and keep chatting with their old crew.

The researchers also checked to make sure this wasn't just a fluke. They ran the numbers in different ways (like checking if the results held up if they ignored July data or changed how they defined a "friend"). In almost every check, the result was the same: Replying to newcomers led to more activity, not less.

What This Means for the Digital Town Square

So, what does this tell us about our digital lives?

The study suggests that when a community grows fast, it doesn't necessarily mean the old bonds break. For the people who took the time to say "hello" to the new arrivals, the experience seemed to spark a bit of extra energy. They didn't feel crowded out; they felt activated.

Of course, the researchers are careful to say this is an observation, not a magic spell. They can't prove that saying "hello" caused the extra energy (maybe the people who were already super active just happened to say hello more). But the evidence is strong: Contact with newcomers was followed by increased activity without any sign of reduced engagement with early partners.

In a world where we often worry that new people will ruin the vibe of our online groups, this study offers a hopeful twist. Sometimes, welcoming the new doesn't push the old away—it just makes the whole party louder, more active, and full of more conversations for everyone.