There is a list[1] of things you can't start tweets with
I tried all of the non-space non-alphanumeric characters on my keyboard. Some worked, most caused an error.
d` d~ d$ d% d^ d& d( d) d- d+ d[ d] d{ d} d| d; d' d" d, d< d. d> d/ d?
> SUGGEST, SUG, S, or WTF - this command returns a list of Twitter users we think you might find interesting and would like to follow.
I got the impression those were SMS commands only, but it would be interesting to learn they'd shut down some of the functions but not all.
And it seems that, when you're a congressman, posting a dick pic even briefly is enough to attract some attention.
[1] http://www.nationaljournal.com/how-weiner-fell-into-the-twit...
A few years back you could tweet FOLLOW USERNAME and that username would follow you