It really, really, depends on the FAs and flight. Sometimes I'll openly have my tablet running, watching a movie or whatever, other times I've had an FA insist I actually power off a Kindle (hold down the switch).

Certainly. However, in cattle car, it's the rubber hose, and no warning.

Alec Baldwin disagrees.

Was it ever known if that was a marketing stunt for Zynga/Words with Friends? The articles I read about the incident pointed out the app specifically, which lead to some speculation.

Words with Friends kind of presupposes cellular connectivity, albeit not with a lot of traffic.

I believe Baldwin's plane was either still at the gate or parked on the runway at the time. He still could have turned it off prior to actual takeoff.