Hmm, as far as I can see, the app gives you a little text message — twitter like — when your friends start and stop meditating, with tallies of their time.
That is great, but it is quite different than doing it over a video feed, where you get to actually see the person, hear him/her coughing, etc. A video feed is a bit like having someone there in the room with you, with all that it implies — I personally found that to be quite powerful, almost as much as meditating with someone else live. I got a really good vibe from the september samatha jhana group, but then it didn't really fit with my weekday schedule (still joining them for the weekends).
So I thought of starting my own thing for weekday mornings... but if I do it, then why not put it out there? I understand, of course, that this won't appeal to everyone

I personally think about this like a room really close to my house where people from my (e-)neighborhood go do their meditation (hopefully). I think that the habits and social bonds that form in this context are beneficial to my daily practice.
By the way, if someone else from europe does want to join, but the schedule isn't quite right, I could move the beginning of the hour to as early as 6h30 and as late as 8h00 (amsterdam time).