Secondly, there are alot more DONTS than DO'S on FB.
Nothing is worse than people whining. Whining about work, their kids, friends etc. Whining and complaining about stuff you do when you meet up with close friends over a coffee or something. You dont put it out for everyone too see.
If you know what you are doing, you can complain on the lack of service you got from you phonecompany or something people can recognize themselves with. BUT, ALWAYS do the "complaining" with a twist of humor.
DONT take pics of food you have made yourself and share on FB. It may look like heaven irl, but when you take a pic with your own average camera, without proper light.. it will look like shit!! True story!
DONT share alot of pics with "good saying" on it. Like these:
DONT overdo the sharing that you are working out.
AVOID 'chain statusupdates'. very annoying when people have copypasted some text about... lets say child-abuse. And they end with "share this if you are against child-abuse". So if friends of yours doesnt share it, do you mean that they are for child-abuse? Ofc not, so avoid these.
DONT do alot of "I have the perfect life" statuses. Alot of people knows you and know for a fact that you dont have a perfect life. And they who dont know you well, probably knows too.