Say your building catches on fire. What do you do?
Do you know where the nearest exits are? Has the fire department been called? Is anyone else in danger? Most importantly, have you summarized the event in 140 characters or less?
That last one is a definite DON'T, by the way, as this fire safety sign for the digital age tweeted by @nycbergs demonstrates. Still, part of the reason it's so funny is that you can imagine people actually needing a sign like this so they don't burn alive checking how many followers they've amassed since the blaze started. Oh, people.
Related: this hilarious Onion video.