Are you more likely to join a My Lot interest if others have too?

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Sometimes I run across a small My Lot forum that I really want to join, like soap operas or lip gloss, etc, but find that there are only a small handful of members. And, then I'm more hesitant about joining the group, cause there aren't enough people on that forum interest to respond to discussions. So, I was wondering, are you more likely to participate in a My Lot forum or interest if lots of other My Lot members are there as well. For instance, Life and My Lot are two of the most active forums on My lot. And, I was thinking maybe that's because when people see how many members have already joined, they want to join as well. And, so those groups just keep getting bigger and bigger! What's your theory on this?