I saw a discussion group the other day, and the topic was "collapse of the world economy" and everyone on the group assumed this as a baseline assumption - the only questions were, when and how?
Most of these are website-based companies like Linked-In, which has an astounding P/E ratio of over 2400. (Look at it this way, the P/E ratio is the number of years you'd have to wait to earn your money back). People "project" the ratio will go down over time, but there are no real concrete plans on how this is supposed to work. "Social Media" doesn't make much money, if any, and trying to put ads on it seems to kill the buzz. Plus, the fad-aspect of it is coming to the fore, and many younger people are moving on to other things.
And before you chime in about the "poor folks in the Ukraine!" look into the Ukrainian government - one of the most corrupt and evil in the world. Four Ukrainian opposition leaders have been shot dead in recent months, and nothing ever comes of it. There is a reason we are not rushing in to support the Ukrainian government.