You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract Why Facebook Gobbled Up File-Sharing Startup Drop.io Social Network Beefs Up Storage, Collaboration, While Mark Zuckerberg Gets an Old College Pal By David Berkowitz, Published on November 02, 2010 0 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Register Now Already a member? Log in.