how about "Follow me on twitter here. I have x followers."?
But if the info could be tailored more (e.g., "2,437 HN subscribers that follow me") I would be more interested. In other words, not everyone finds following the most massive crowd a sign of value.
"You're following X, Y, and Z, who are also following me; you should too."
I don't really like the tone I wrote, but you get the idea.
"You should join my 4,615 followers on Twitter _here_. Everybody uses it. All the interesting people follow me. You really need to follow me now. I can't believe you're reading this when you could already be following me. DO IT DO IT DO IT. Fine. Enjoy your miserable life without me and die alone. Don't you want to be popular and interesting?"
Am I doing it right?