Yeah 25 max in a Skype group if you want to be able to start a call in it, based on my experience with brony groups.

I'd probably just listen in and tappy-tap on text chat unless drunk enough (shyness etc) but would be glad to see this going

The other thing I remember from days gone by was an FF radio station. There's one around but it doesn't look like it's on air - can't verify at the moment due to being at work