Could be that people haven't caught on yet or haven't found the time to move all of their files over. Hell, I do Epinions reviews on a regular basis and find that for all the 30 minutes or less it takes to draft one, my brain doesn't want to click.
I drafted a [link=http://groups.yahoo.com/group/LPSG_ORG/surveys?id=950933]poll[/link] surveying the members, and it's just shy of a 50-50 split. Though I could have done without the porn and the spam, MSN operated a little more efficiently / swifter than its Yahoo counterpart. And for some reason, I hardly find anyone in chat no matter what time of day it is. Either we're scared to mess around with the new stuff... or maybe there's a declining interest...
Granted, I think everybody's going to love the photos, but I think most of the chatting that goes on between the members is over instant message programs on their own free time.