- I never feel obliged to follow someone, just because they follow me. If they have something interesting to say, sure. If they strike up some conversation with me, sure. But if I find what they say uninteresting, I don't see the point in following them, just for their tweets to clog up my feed.
- Feel free to block/unfollow if you want. Blocking spammers/bots is actually recommended. Being unfollowed shouldn't be taken as an insult. Some people find themselves following far too many people to keep up with, and if you aren't saying anything that interests them then they may unfollow you. Same thing the other way around. If you aren't interested in someone's tweets, unfollow them.
- Follower numbers don't interest me. I would rather someone follow me because they find what I say interesting, or want to get to know me than just to have a certain number of followers. It's always nice when someone genuinely starts following you but high follower numbers are not the point of Twitter if you ask me.
- Retweeting. The idea behind retweeting is to show your followers something from someone you follow that you found particularly interesting/amusing/etc. and want to show others, not just as a means of replying. I don't need to see your replies to people I don't follow. Especially as it comes as loads of snippets of the conversations I'm not privy to.
- Run-on tweets. Personally I don't mind these. Sometimes 140 characters just isn't enough space, which is fair enough. Just don't make it a habit. It leads to clogged-up feeds. Anything longer than a few tweets should be taken elsewhere.
- Twitter is a place to vent if need be. But don't let it be the only thing you use Twitter for. People are not going to continue to be interested/sympathetic if you repeatedly post about how bad that cup of coffee was or something. It'll turn into a case of the boy who cried wolf.
- Don't feel scared to jump into conversations in your feed i.e. to tweetjack them. They will often welcome your opinion.
So those are my top ones that I can think of. Of course, these rules are more of a guide.
Any others that you think should be here, or ones that you disagree with?
Any others that you think should be here, or ones that you disagree with?




