Yeah, I was highly resistant to it at first. And then once I signed up, I didn't use it at all for probably a good 6 months. But then a certain critical mass was reached, where most of my friends were on there, and I was finding old long-lost friends and finding I could also keep in touch with faire friends and the like, that's when it became part of my daily life.
Now we all share photos, pass around links to funny videos, etc. It's a nice lightweight way for everyone to keep in touch.
Just note that if you post a ton of useless stuff constantly, I'll "hide" you from my news feed and never see you again... lol