We're in the process of launching a new company with a unique name (not an existing word), and it just so happened that someone, by complete coincidence, already registered that username on Twitter for a personal account in 2009. It's just a teenage girl and she only tweeted a couple of times years ago and hasn't used the service since 2009. We tried tweeting her but didn't get a response. What do we do - can we send Twitter a copy of our business registration and ask for the username? How long will that process take, and will we need a trademark first? Thanks ATOT!