Facebook for friends and family.
LiveJournal for keeping up with the few remaining people who use LiveJournal, and also for RSS feeds.
Twitter for searching for links or commentary on live events, eg. football games.
Reddit for searching for information, generally regarding video games.
Instagram for looking at pics people I know took that may or may not be on Facebook. Rarely I might post something.
DeviantArt for art.
YouTube for videos.
Of these, I only really use Facebook on a daily basis although YouTube and DeviantArt get used often enough to say I'm a regular. I lurk Instagram pretty often, too. LJ, Twitter and Reddit... *shrug*