Twitter is joining the ranks of internet outlets helping you exercise your right to vote. It's allying with Rock the Vote to launch a feature that helps you register in the US through a simple chat assistant. All you do is send a direct message to Twitter Government (@gov) and punch in your ZIP code when asked -- the account will tell you how to register, including a web link for signing up online. If you're a first-time voter and aren't eager to navigate websites to get answers, this could come in handy.