Twitter has been known to create panic (see: Felicia Day and "Dollhouse") and unjustified optimism (see: any post about "Knight Rider" returning). But "Heroes" actor Greg Grunberg (@greggrunberg) says his NBC show will be back for more. "'Heroes' is going to be sick on Monday! Sick!" he said early Sunday morning. And in case anyone thinks the next two episodes of the NBC series is the last, think again. "These are the last two episodes of this season," said the actor who plays Matt Parkman in the series. "We will be back for Season 4!" Of course, whether that's optimism or some inside knowledge, only Grunberg knows. Grunberg's Twitter pal Wil Wheaton (@wilw) has been focused squarely on the National Hockey League playoffs, but the "Star Trek: The Next Generation" actor is ...

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