I work in the conference industry, and thus usually attend about 25-30 difference conferences each year. The cell phone/tablet/laptop thing boggles my mind. No matter what the subject matter there always seem to be a group of people that are just dicking around on facebook in the back of the room.

Some of the conferences we handle have crazy high registration fees. Why would you pay the massive fee to attend, then show up and not listen to the presentation? Just walk out if you're not digging the talk!

Agree completely.

Yup.