Mike Tomlin OKs Twitter, with caveats

PITTSBURGH -- Steelers coach Mike Tomlin doesn't care if his players are avid social media users. Just as long as they don't talk shop.

Although quarterback Ben Roethlisberger's return from a four-game suspension is certain to be a subject of locker room conversation this week, Tomlin doesn't want his players posting messages on Twitter, Facebook or similar sites about any team-related issues.

Aware that tweets by NFL players occasionally cause a stir -- the Bengals' Terrell Owens tweeted an hour before kickoff Sunday, in apparent violation of NFL rules -- Tomlin said football matters are off limits.