More than one person has suggested that I start tweeting, but I'm afraid to. As my nearest and dearest have observed "Who would follow you on twitter?" It would be mortifying to be on twitter and have no followers.
Yet tweeting is like bird song. A bird who sings early, long, and well will typically be healthier, and a better mate, than a bird with a weak and feeble song. Bird song thus signals reproductive fitness. So why do birds with low quality songs still sing? Because a quiet bird is signalling loud and clear that their song isn't worth listening to. Unless one is the most tuneless bird in the forest, singing is always the optimal strategy.