[mattmanser]

It's a critical mass thing, if all your friends use Facebook to organise parties/events, you will eventually start missing stuff.

I know because it's happened, quit FB for a year a few years ago and missed at least 2 get togethers/random dos just because people forget to invite you off Facebook.

Although now I've got some friend groups that organise stuff on whatsapp, and others on FB, which is probably part of the reason FB bought them.