Facebook's "25 Things About Me" meme seems harmless enough; people write 25 facts about themselves and post them on their Facebook pages, just as they do with videos, status updates and photos of last weekend's party. An estimated 5 million of these notes — that's 125 million facts — have appeared on the website within the past week. Assuming it takes someone 10 minutes to come up with their list, this recent bout of viral narcissism has sent roughly 800,000 hours of worktime productivity down the drain.