The only tweets during the Miami Dolphins scrimmage Saturday will come from the officials' whistles.
The Dolphins are at the forefront of an NFL clampdown on Twitter and other social media, with new restrictions imposed on players, reporters and even spectators.
Miami's secretive Bill Parcells regime prohibits fans and media at training-camp practices from tweeting, blogging or texting. At least six other teams have also imposed such restrictions on reporters, even though the workouts are open to the public.
Twitter intolerance is no surprise in a league where paranoia is part of the playbook. Like many Americans, coaches are anxious and a little confused about the rapid pace of change in communication.
"I don't really have a Twitter policy," Denver coach Josh McDaniels said. "I don't know what it means; I don't know what it is. I don't know MyFace, Spacebook, Facebook stuff. I don't know what that is either."
McDaniels mangled the Web-site names in jest, and the Broncos actually do prohibit tweeting. Such restrictions run contrary to a recommendation from league headquarters that teams allow tweeting and blogging during training camp practices.
"It is not practical to prohibit media from doing some reporting (via tweeting, texting, blogging, etc.)," a league memo to teams said.
Along with the Broncos and Dolphins, the New England Patriots, Buffalo Bills, Indianapolis Colts, New Orleans Saints and Detroit Lions disagree. They don't allow reporting from the practice field.
The Broncos also banned cellphones and computers at workouts to prohibit fans from tweeting or texting. The Colts went a step further by prohibiting reporters' notebooks (the spiral kind) at practice, but the ban was quickly rescinded.
Some teams, including the Dolphins, have urged their players not to tweet. Other teams are more lenient about the use of social media. All teams are weighing the impact of the new modes of communication.
"When cellphones came in," Dallas Cowboys coach Wade Phillips recalled, "one team had a player on the sideline during a preseason game who was on a cellphone. So you have to come up with rules when these new technologies come out."
The Cowboys don't prohibit players from tweeting. Neither do the Carolina Panthers.
"Not yet," Carolina running back DeAngelo Williams said. "But I know it's coming."
Driving the clampdown is a fear important information might leak out. Twitter allows for only 140 characters, but "I broke my leg" requires just 14.
"Coaches certainly are paranoid," Phillips said.
They fear opponents might gain a competitive advantage from even the briefest tweet about injuries, personnel decisions, trick plays or food. The Chargers allow players to tweet, but fined cornerback Antonio Cromartie $2,500 for using Twitter to complain about training camp chow.
NFL spokesman Brian McCarthy said the league encourages players to tweet, and about 300 do so. As of Wednesday afternoon, the league had 772,473 followers on its Twitter site.
"We've been at the forefront as technology has changed," said McCarthy, who said he follows 600 Twitter accounts. "We have embraced Twitter. The commissioner tweeted from the draft. When done properly, it's a tremendous opportunity to talk with fans."
Some coaches remain unconvinced. The Dolphins' Tony Sparano conceded he's not well-versed on the new social media, but he urged his players to steer clear of Twitter.