I find it hard to grasp why any intelligent individual who knows what goes on with Facebook would still voluntarily remain on Facebook. "Ah but the social ostracization!", seemingly the main reason why otherwise intelligent, informed people do stay on Facebook, just doesn't hold up anymore, as too many cool, socially active 20-somethings I know or are acquainted with have moved off of Facebook, mostly in last 1-2 yea…
Facebook groups and messages however are just so incredibly convenient and ubiquitous that you won't be able to convince entirely separate groups of people to leave and use a service you mandate - unless you are friends with solely technical people.
Could I be a member of the groups and organizations I am without being in the Facebook groups? Sure - but it would inconvenience everyone, if there's a discussion in a group, and someone tags me to get my opinion on something, I can fire back a reply. They don't have to call or email me separately.