Another Smugmug fan here!! I've taken into consideration Flickr too, and i use the free account, but I love the way I can organize my pict with Smugmug better. Plus I can share a private album with anyone and that person may not be on smugmug, on Flickr you have to sign in with an yahoo account to see my private/family picture. So that's easier to me
Use photobucket too, just to post pictures here and there.
Just a note for ladies posting pictures on Facebook, read very carefully their "Statement of Rights and Responsibilities", where it states that "For content that is covered by intellectual property rights, like photos and videos you specifically give us (...) a non-exclusive, transferable, sub-licensable, royalty-free, worldwide license to use any IP content that you post on or in connection with Facebook...". I know it will end if I delete my picture (even if they says your pict may still be on their server for a while...) But I am just not ok with that, so I just don't post many picts there. Yes, I know it's not that big of a deal but I'm that boring when it comes to copyright lol 
Anyway, just wanted to share a thought.