> Curious, how many people do you need on a social network before you can find someone to talk to or before it is engaging enough for you?

I don't think that's a meaningful parameter to think about? I'd say that on any social network, I have meaningful, ongoing relationship with maybe 20 people. I suspect that's the norm. But that doesn't mean you can join a social network with 20 users and get that. I mean, if it's a mailing list for friends and family, sure. But not if it's 20 randomly-selected strangers from around the world.

So the critical mass to make the "random stranger" type of a social network work is much, much higher than the number of daily interactions you need to keep coming back.

Yes, all you use is 20, but as the number increases the odds of you finding your 20 goes up. I'm saying in 100,000 roughly randomly selected people, I have basically a 100% chance of finding my 20. 50,000 is probably enough.

By the way, if your number is not the same as mine, I am not intimating that this makes you deficient in some way. Everyone has their own number.