Annoying tweets

• ranting
• 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!)