15 doesn't seem all that high - a few things you want to say, a few responses to people's replies, then maybe a back-and-forth conversation with someone adds up

15 doesn't seem all that high - a few things you want to say, a few responses to people's replies, then maybe a back-and-forth conversation with someone adds up pretty quickly. I think time spent might be a better measure though - e.g. I can fire off 5 tweets in a couple of minutes, then never think about Twitter from the rest of the day, or I can spend an hour crafting a single tweet, reading replies and other feeds, and repeatedly check for new responses. I'd say the latter is much more akin to obsessive behaviour, but has a much lower tweets/day average.