Re : Twitter app .

Re: Twitter app. Unless something has changed in it (it's a couple of versions since I used it), it stores all its cache in "data", which you can clear out by going to "manage applications" in settings. If you do clear out all the data, you'll need to open the app and log back in again. Other apps, eg TweetDeck, have this stuff more easy to clear out in a "cache" section, but Twitter doesn't do it properly.