- complaining (esp. when it's about something they have no control over)
- any tweets with 3 or more hashtags
- especially annoying if they contain hashtags + mentions + link(s), since clients often make the hashtags, mentions, and links different colours than the text
- talking almost exclusively about social media (esp. Twitter itself)
- "did you know that"-type tweets without citations
- compressing words to fit 140 characters, making them all but unreadable (why not just make two tweets?)
- quotations from famous people, or famous quotes (usually banal)
- the worst is when someone makes the quote and makes it seem like they're the one originating it.
- retweeting mentions of you that don't really add any information
- example, Acme company, with the Twitter account @acme, retweets how someone loves @acme products? Yeah, so?
- "[Place name], I am in you." Oh, no, honey, we don't do that anymore.
What You Might Think That I Consider Annoying, But Actually Like
- overheard "OH" tweets
- talking about what they just did, esp. if it's something that didn't involve them sitting at a computer
- talking about something they're doing, to get on people's radar
- asking the Lazyweb for something, but only if they've put it some work into finding the answer themselves, e.g. #reco
- self-promotion (why the hell not? How else am I going to know the latest awesome thing you did?)
- retweeting your other account (not too bad when done in moderation, and maybe I didn't know about your other account?)
- retweeting someone's answer to your question (that's great! Now I know the answer you got to your question!)