Grab Up to 768 MB Free Dropbox Space Through Social Media Connections Need a little more space in your free Dropbox file syncing account? Already run through the "Getting Started," .EDU referrals, and all your friends? If you hook Dropbox up to Twitter and Facebook, you can snag up to 768 MB more storage. You don't even have to actually post anything about Dropbox to your Twitter or Facebook accou