Bollywood star Aamir Khan says he will soon post his first message on microblogging site Twitter but before that he plans to do a live chat on Facebook to keep the impostors at bay.

"I've been using Facebook a lot... the problem is anyone can be an impostor on the Internet. So I am thinking of a live chat on Facebook so that people will at least know it's me and not some impostor, " said Aamir here.

And the reason for the actor's concern is genuine.

"I have close to 300,000 friends on Facebook... I stay in touch with my friends and fans there and both of us know each other, " he said.

Looking dapper in a jet black Chinese collar suit, the 45-year-old was in the capital Wednesday, in a younger than ever avatar, to launch two new smartphones - Samsung Wave and Samsung Galaxy S.

Aamir is the brand ambassador of Samsung.

Asked about joining Twitter, as advised by none other than the Big B, he said: "Since Amitji has asked me to join Twitter, I guess I will soon have to be on the social scene as he has got that kind of voice, I just can't say no to him. But I don't know how regular I'll be on Twitter.

"Amitji showed me the functions of Twitter when we were in London and right now I am just trying to understand it. I'll send my first tweet soon."