I disagree. One of my company’s implemented an Oracle DB for a Fortune 100 company that handles all of their assets world wide and EVERY daily transaction from Purchase Orders to a Maintenance guy putting a drop of oil on a machine in Bum F Egypt; including inventory of parts and finished goods. Daily data dump is in the hundreds of gigs. Makes Facebook look like child’s play.
Feel free to disagree, but I think you need to improve your knowledge on Facebook's internal systems. There are several papers/preso off of
infoq.com and
highscability.com if you're so inclined. Both sites also have architecture information on other web scale companies.
I'm sure at one time hundreds of gigs per day was impressive. A year ago, Facebook had roughly
130TB of
logs per day. I'm sure that's gone up.