"The best solution is to not need money. The less you need investor money, the more investors like you". That's true if you are dropbox, airbnb and other startups that have a solid revenue avenues other than advertising. If twitter or facebook itself had been founded after that disastrous ipo (facebook ipo) they would be in a worse position than dropbox or airbnb in terms of funding and revenue. That said, i think facebook will get to its intended valuation within this year.