[bradlys]

Just curious - how much organizing do you do? Do you host events with any regularity? Do people like to ask a lot of questions about your events or want to share publicly that they're going to them with people? Do people sometimes want to know who is going to your events so that they can choose when not to go because they don't like that person? (And when someone is going so that they can go) Do you have a very active group of people who like to interact with each other in a public forum? Now is that group size beyond 100 people?

You'd be surprised how crap email is for any of that. You'd be surprised how people don't want to have 10 different apps for all the activities and prefer one central source to catch up on everything. Facebook can be very useful.