Where in the World is Charlie Sheen?

— -- Earlier this year, it seemed nearly impossible to get Charlie Sheen to shut up.

He did a slew of media interviews, then took his act on the road, for his Torpedo of Truth tour. He broke a Twitter record, joining the social media site and quickly garnering over a million followers in one day and coining such phrases as "tiger blood" and "winning." And his antics -- filing a $100 million lawsuit against his former "Two and a Half Men" employers, breaking up with one of his live-in goddesses, and insulting his former co-star and two ex-wives -- kept him in the headlines.

So the silence coming from Sheen's camp now is almost deafening. Since completing his tour in May, Sheen has been mostly MIA.

Sheen's rep did not respond to requests for comment from ABCNews.com.

But a friend contacted by ABCNews.com said, "I've seen him and he's doing O.K.," refusing to elaborate any further.

Sheen will also be missing on this year's Emmy ballot.

After two opportunities to submit his name for consideration for his role on "Men," Sheen failed to do so by the May 25 drop-dead deadline, according to The Hollywood Reporter.

"It's up to the individual, whether they want to engage or not engage," Academy of Television Arts & Sciences chief John Shaffner told THR. "It was his choice."

Without his name on the official ballot, Sheen, a four-time nominee for "Men," has no chance of winning for the series, now that he's been fired and replaced by Ashton Kutcher. He's also unlikely to show up at this year's Emmy ceremony, clearing the way for host Jane Lynch to make all the Charlie Sheen jokes she wants -- though she may hold back since she's put her own name in for her guest role on "Men."

Sheen's former co-stars Jon Cryer, Angus T. Young and Holland Taylor also submitted themselves, but Warner Bros. did not submit the show for outstanding comedy series.

Cryer, whom Sheen dubbed a "troll" and "traitor," recently spoke to David Letterman about his former friend's quick downward spiral.

"It's as much a mystery to me as to everyone, I think," Cryer said Wednesday.

"I love him, he's a great friend," Cryer added. "None of us wanted to continue with the show if we felt like it was hurting him, and there was a point at which, we felt like, there's no control over him."

And now there seems to be few sightings of him. Sheen had been scheduled to take his tour to Australia and Europe this month, though there's been no word on the tour's status.

As for accompanying his friend Sean Penn to Haiti, as Sheen promised in March, Penn's rep told ABCNews.com, "The trip has not happened."