From large public schools such as Western Kentucky to smaller private ones like Birmingham-Southern and Smith, colleges around the country have revamped their orientation talks to students and parents to include online behavior. Others, Susquehanna University and Washington University in St. Louis among them, have new role-playing skits on the topic that students will watch and then break into smaller groups to discuss.

Facebook, geared toward college students and boasting 7.5 million registered users, is a particular focus. But students are also hearing stories about those who came to regret postings to other online venues, from party photos on sites such as Webshots.com to comments about professors in blogs.

"The particular focus is the public nature of this," said Tracy Tyree, Susquehanna's dean of student life. "That seems to be what surprises students most. They think of it as part of their own little world, not a bigger electronic world."

The sites actually help with one of the major goals of orientation: bonding. At Birmingham Southern, dozens of members of the incoming class of about 350 had already formed a Class of 2010 Facebook group long before the start of school.

"That's great," said Renie Moss, the school's dean of students. "That's what should be happening, forming that camaraderie. But we're hoping to just maybe give the students a moment to pause and make sure they put out something they can be proud of."