Do you have an old Commodore 64 laying around? Dust it of, buy a MMC Replay and download BREADBOX64. And you should probably take a look at Johan Van den Brande homepage. All this will make you Twitter on the good old C64.
Johan Van den Brande is the man behind BREADBOX64. He says that the software will work on both emulators and the real thing. Why you should use the C64 for twittering is up to you. But it’s cool, and from the YouTube-video he uploadet, it looks like it works to.