I've been on Facebook since the times it was only available to universities and everyone else used MySpace. For the most part, I've been able to fit in just fine. I generally keep negative posts to a minimum (the last time I posted something "negative" was during Valentines day saying that I was "feeling a bit stressed and Valentine's day isn't helping"), because it brings others down and they would get tired of it. I don't post all the time, and I don't get a lot of feedback from my posts, but the feedback I do get is generally positive. I try to entertain people with my posts and responses, whether it's something of interest, photo/video, or an amusing observation.
Facebook does have its annoyances:
-People who send you requests for and spam your news feed with games, apps, etc. and you can't block them fast enough
-People who post nothing but politics or religion. On the other hand, this is a free country, and everyone is entitled to his or her own beliefs, so I can't complain too much
-Some advertising (I know there's blocking software, but that does not work across all platforms). On more than one occasion, I've hit the "X" on an Autism Speaks ad, selecting "it was offensive" for the reason I did not want to see it.
-Facebook's constant "nudging" me to do things that I have no desire to do, such as suggesting that I like something or add a complete stranger as a friend.
-The mobile app, which not only messes with your contact list and tries to "help" by synchronizing with my friends list, but it activates the GPS when it has no business doing so.
-The frequent interface changes that are forced on you whether you want it or not. First there was "new Facebook", then the cluttered news feed, then the Groups changes (I still miss the old groups) and various other changes, some better and others worse. I have not been infected with Timeline...yet.
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"Tongue tied and twisted, just an earth-bound misfit, I" - Pink Floyd
(and then the tower cleared me for take off)