We can no longer hope to maintain separate online and offline personalities. Just look at the number of celebrities whose private lives are being made public and having adverse effects on their careers! I think you need to apply the same due diligence to curating your online content as you do your appearance, relationships or profession.
Those friends of yours who appear to have the perfect marriage may post gorgeous photos of their weekend in Montreal, but they are not going to post updates about their massive debts or the fight they had last night about how to manage them. That colleague who just posted the ultrasound photo of her first child may not have tweeted about the three miscarriages she had prior to its conception.