Which is the most famous chat program now?

This one is a simple questions and a polling panel to check which is the most famous chat program now. There are many chat sites that you may be using. my usage depends on the use. If it is official I prefer pidgin and when to chat with friends I prefer Gtalk. Now please tell me which one is your favorite? So which Chat service are you use more often ?
Yahoo -- Yahoo Messenger
Google -- Gtalk
MSN -- Hot mail

Advance thanks for any replies.

Google talk is the most famous chat program now.I often use this program to chat.It allows instant messaging.Google Talk uses XMPP to provide real time extensible messaging and presence events, including off line messaging and voice mailing.The offline messaging also possible in Google talk.Google try to add more and more facilities.It makes the chatting more easy and interesting.Any way g talk is my favorite.Thanks for such a poll.

Gtalk is my favorite than any other chats. Gtalk is getting popular these days due to its flawless service and performance. First there was only yahoo messenger and I was a maniac to that that time. But now I don't even use messenger. Its quite boring now and one main thing is that this chat programs gets easily effected by viruses. I am a victim for that and now I stopped this chat. And MSN, I am not at all used to it. Thanks for a good topic and have a great day.

I think msn is the best chat messenger now days .

Yahoo -- Yahoo Messenger (Popular in people using internet just for fun)
Google -- Gtalk (Popular in search marketers, as they are deeply in luv wid Google)
MSN -- Hot mail & Skype (professionals of all kind)

Of course its my observation, needless to be 100% correct!

From my point of view Gtalk is the most famous chat program now...
Because...all facilities are provided by i google...also it is a search engine...so promotion of Gtalk is on large scale..gmail users are more...so famous one....