Just so you're aware, TXTMob is historically the name of a famous-in-very-small-circles group SMS service from 2004. Released as an activist digital art project and used to organize protests, it's often cited as one of the original influences for Twitter. It's not a name that the average person on the street would recognize - and fortunately TXT won't be confused with Text by search engines - but it's worth being aware of it. (Unless you did it intentionally, in which case, love the shout-out. :) )