This is my one and only tip in regards to dealing with heavy social networkers and meeting content: When you rely on common sense, you’re relying on subjectivity.
As the meeting organizer, you should assume that any content you share during your meeting will make it out into our wonderfully grand World Wide Web. If you want to place boundaries around what can and cannot be shared via social networking, you’d better be clear about it upfront. Otherwise,
everything is game.
Take five minutes in your agenda to set Ground Rules. If there are certain things that can be broadcast but other material should be considered confidential, then create a simple legend to let your audience know what you are comfortable with them sharing.