Mine would be when people RT every single Happy Birthday tweet that they get, like is it really necessary to clog everyone's TL with the same message over and over, as if anyone cares that its your birthday in the first place. Stop being messy and just favorite the tweets and let us tweet in peace.
Too many selfies. Like... Are you really that self absorbed that you have to take a picture of yourself when you look the same as the day before? Oh, and do you have anything interesting about your life? Are you interested in anything besides yourself?
When people post a status that's for attention. Like "Just had the hardest decision in my life" and you're like "...welll...what was that?" and they respond "I'll message you". Why make a status about it then not want to tell people? lol
People that retweet every reply they get
People that RT/quote tweets w/ no reply. I mean, why couldn't you just retweet it the normal way?
People that reply to their own old tweet aka a cover-up for begging for more favorites/RTs
