This includes Facebook, Twitter, Picasa, Yelp! as well as other mundane sorts of sources like calendars, databases, CRM systems and so forth...
So what there is to watch for next is how well systems offer to fit together. This is why I think it's silly to engage in silly conversations like "Which is better, Facebook or Twitter?" The answer to that question is simply, "Yes!" I use them both together. And each one is better than the other.