Using TweekDeck on Windows 7, I've noticed - to use two people as an example - when I go to create a new tweet to someone - I type in @ then the name, but for some reason even starting that with Prof, which should bring up Brian Cox's name (!/profbriancox), doesn't bring up anything. Much like trying to tweet to!/greencatherine. Tried putting @green, and nothing comes up. Am I not putting their name in correctly, or using the wrong words to bring up their profile or what?