Who's tweeting now? Guillen is, but Piniella refuses to

Ozzie Guillen's already going to star in a reality series starting in July. Now the colorful manager of the Chicago White Sox has a Twitter account, and his team's general manager, Ken Williams, is not happy about it.

Guillen, who will appear in the MLB Network reality show “The Club” this spring, said his tweets will be personal and not a way to tell fans what’s going on with the White Sox or a way to break news.

Still, it appears to be a dangerous device for a manager who’s gotten in plenty of trouble over the years with his comments.

Williams wasn’t thrilled.

“No comment … and make sure you write that it is a no comment with a head shake from side to side,” Williams said.

“Listen, I’m a grown man,” Guillen said. “I talked to Kenny about it. I said what it was. He can see what I say. If that thing offends anyone, beat it, because I didn’t do anything wrong.”

Asked if he might start a Twitter account like his Chicago counterpart, Cubs manager Lou Piniella, said no thanks.

“What is Twitter?” Piniella asked. After being informed of how it works, Piniella added: “Ozzie … he needs more space than that.”

But don’t expect Piniella to jump in on social networking.

“First of all, I don’t know how to Twitter. Second of all, I’m not going to learn how to Twitter. Look, I’ve heard of Facebook. Actually, it’s on my phone; I see it once in a while,” Piniella said.

“But I’m really not a Facebook or Twitter guy, you know? I’m a prime rib and baked potato guy.”

Short hops

Major League Baseball is hoping to test minor leaguers for human growth hormone this year. It must first reach an agreement with the players’ union. … Rangers manager Ron Washington said he plans to use Vladimir Guerrero in right field from time to time and not just as a designated hitter. … The Mets signed catcher Rod Barajas to a one-year contract. … Pitcher Livan Hernandez, a former World Series MVP, agreed to a minor league contract with the Nationals. … Derek Jeter, whose contract expires after this season, said he wants to stay with the Yankees.