1. People who don't know how to 'Pin'.
There's nothing more annoying than coming across and awesome looking pin on Pinterest and clicking on it to find that the link takes you to all kinds of crazy places. I've had pins take me to just a blog's homepage, instead of the specific post that should've been linked to the pin. I've also once clicked on a pin for some sort of dessert, and was taken to a post about sandwiches or something. It's simple - make sure the thing that you're pinning links back to the place where you found that 'pin' in the first place.
2. The serial tweeter.
Some people have twitter conversations, so they pop up a lot on the main page. That is understandable. But when someone is just tweeting to themselves, a million tweets by the minute, it's just annoying. I follow more than 550 people. You should not be flooding my twitter homepage. Just sayin'.
3. The Facebook on again / off again relationship.
Oh, today you love your boyfriend. Oh, now you hate him? You're broken up. You're back together. He's a scumbag. He's the love of your life. Make up your mind, or at least keep your craziness off facebook. I don't need to hear about every fight you have.
4. 'Come Follow My Blog' bloggers.
I hate having people ask me to follow their blogs. Usually if people have to ask for followers, it's because their blog isn't keeping people there in the first place. Great content doesn't need to beg for followers. If I like you're blog I'll follow it because of that, not because you ask me to. And if you ask, I'm less likely to even give it a chance. Sorry, but that's just the way I am.
5. The people who post a million times a day.
If you have important things to say, I can understand more than one post a day. More than three posts a day? I can't find a reason why you'd need to post four times. Tomorrow is another day, I'm sure the fourth post can wait.
What bothers you about social media?