Tweeting and driving is just as bad as texting and driving. We know the PSAs specifically say "texting," but don't be an asshole and get caught up on semantics. Hopping on Twitter to share your (probably) meaningless observation is just as destracting as sharing your (probably) meaningless observation with just one person.
When the paramedics are plucking your teeth out of the steering wheel, it won't matter which means of communication caused you to murk yourself. If you're laughing at how painfully obvious this is, just wait until you see these tweets. It's frightening how many people shamelessly share that they're driving distracted. Shake your head at 25 People Who Shouldn't Be Tweeting and Driving.