As fervent Opera user I obviously have to use and like
Twidget.
I'm not your typical Twitter user though, I just use it as an alternative to RSS feeds. If I ever post on my Twitter it's mostly because some jackass site has a raffle or giveaway and require you to do so.
I'm following
http://twitter.com/ukgamedeals (the EU part of the cheaparsegamer website)
http://twitter.com/RezHD because I love Rez and nothing ever gets posted there.
http://twitter.com/Q_Entertainment because of RezHD and the possibly awesome, possibly awful Child of Eden. And Meteos. And other games.
http://twitter.com/GOGcom I don't know why, really.
I even have a follower, but why the hell anybody would want to follow my dead spam-infested twitter feed is beyond me. He/She probably hit a random button while mashing the keyboard with their face.