facebook is awesome... but only if you know lots of people using it. I'd say it's now huge amongst my friend group (3rd year/recent alumni - and it's the non geeky crowd that use it the most).
It's a great place to put things you want to share - the best example being that we all went out last night, and by this evening over 3 different people had uploaded their pictures from the night - with an instant notification to all of our friends.
Some people won't like that, and think that it infringes on their privacy - that's fine, social networking webstes aren't really going to be your thing... but for those that don't mind what if their friends see what they've been up to then it's very useful - significantly easier than using sharing folders on msn/uploading to flickr then emailing everyone etc. Facebook was very *meh* (although better looking than myspace) until they added the newsfeed feature - that _really_ propelled it into the spotlight (most people i know have now stopped using myspace).
The site also works most of the time (i've not experienced an outage yet) unlike myspace which is buggy as hell. And the "networking" facility is interesting - unlike myspace where everyone is in your "extended" network.
[sorry for the rant on an old old thread :'( ]
edit: it's also replacing msn between people you "kinda" know. those people that an msn conversation would list about 3 minutes with, whereas facebook message is more like email and can last weeks and be infinately more interesting that "so how's work?" etc.
