well that was my experience, I didn't even know I was getting mentions, until I installed TweetDeck. We aren't talking about active twitter users here. We are

well that was my experience, I didn't even know I was getting mentions, until I installed TweetDeck. We aren't talking about active twitter users here. We are talking about a new person, who just created their twitter account. Of course someone who is active on twitter knows about @username.