I got an android phone recently and started using twidroyd yesterday. The first time I tried to tweet from my phone, when I hit 'done' a 30-char-or-so ad for Twidroyd was appended onto my (20-char-or-so) tweet. I was rather irked that I had to go back into the text edit box to delete it. I uninstalled the app immediately (thanks VM for not locking down the base ROM to prevent removing this default app, I guess) so I don't know whether this is only first-use behavior or persistent, but it is rather sleazy and annoying and I don't blame Twitter for banning them for this sort of horsecrap in the slightest.