Social media is a big topic of discussion at Sun Valley. And Google, the king of Internet search, has been talking to the various players.

Google CEO Eric Schmidt said on Thursday that he’s “chatted” with the MySpace folks while at the conference, and noted that Google has had many conversations with Twitter in the past.

Google’s $900 million advertising deal with MySpace will expire next year. Some analysts believe any new deal will involve Google paying considerably less money to run ads on MySpace, whose popularity been eclipsed by Facebook.

Asked whether Google would pay $900 million again, Schmidt replied “we never say never.”

“Remember the economics are different, the traffic is different, market positions are different. That’s why these deals expire,” he said.

As for Twitter, which was previously rumored to be a Google acquisition target, Schmidt said Google talks to Twitter a lot, though he did not specify about what.

“We’ve had a lot of conversations. There’s nothing to announce,” he said.