[noblethrasher]

The Bat Signal is more secure.

1. It's inherently asymmetric (Batman can observe the message but messengers cannot observe him).

2. It's highly unlikely to be forged.

[m0nastic]

1.) Twitter is also asymmetric

2.) I'm pretty sure that what seemed like a good third of the sixties Batman TV show episodes involved Batman showing up to the Bat Signal only to have it have been a trap. (and yes, I consider the TV show to be the canonical Batman).

[noblethrasher]

Fair enough on point 2. But he'd have to be careful about viewing his Twitter account wouldn't he?