I am not on Twitter, I refuse to get involved. Ironically I rarely bother to carry a cell phone (though I do have one) and generally refuse to get one of the more complicated ones. Simply because I find the whole subculture around this kind of thing increasingly annoying.
That said, I find it ridiculous that people are coming up with things like this in the current economy. I suppose if we were in a decadent "roaring twenties" type upswing it would be one thing, but right now I can just imagine some poor goober with all his money tied up in this idea praying it catches on.
Personally the only potential use I could think of for something like this is if you could somehow hack it into the site/phone/whatever of someone you didn't like so they couldn't get rid of it and had to deal with endless pet spam. But then again if your going through all that trouble you could just make a program to do it itself.
Truthfully I consider the most epic failure of the theory of evolution is that despite the evidence present in the yearly "Darwin Awards" that inevitably we're going to see twitter enabled sexual aides, and sadly the people using them by their very nature will be breeding and thus locking this into the genre pool.