Hollywood actor Seth Rogen is hunting down an internet impostor who has been posting fake messages posing to be Rogen on social networking website Twitter.com.

Thousands of fans have ‘befriended’ the Knocked Up star on the website which allows users to interract with the public.

But Rogen insists it’s not him.

He says,

“That’s not me on Twitter.com I have never partaken in any social networking website on the internet. I’m not on Facebook, MySpace and I’m definitely not on Twitter. But apparently there is a fake ‘me’ on the website.”

“It’s so a world I don’t have anything to do with. I just think it’s bullshit. Go out there and talk to people.”