fun: following tweeters who link to enjoyable stuff on a regular basis, and if you like music, there are those who link to blip.fm, grooveshark, etc. there are also twittergames like spymaster and the natsulion app “tweet n seek” game. useful: tech support from companies and app developers: giveaways and contests for all sorts of things (marriothawaii just ended weeks of giving away a week at marriot in hawaii, one week for each island, for example). you can get your daily horoscope, your weather, and other stuff like that tweeted too. plus you can tweet on computer, IM, sms, iphone app, and on any device that connects to the net (and that can type, tho you can also just read). it takes awhile to find a good personal mix to follow, but it’s easy. just click the trends, read tweets on it. if someone seems interesting, follow. if they’re not, unfollow. takes two seconds. and this is only a partial list.