Jessica Jackely -- the founder of the immensely popular microfinancing platform Kiva-- has launched website with similar aspirations but for startups and small businesses called ProFounder.
ProFounder enables users to create a profile and connect with their friends and family to secure seed money for their business. In their profile users set the terms of the loan that will be attached to any seed money. ProFounder also makes it easy for users to craft their pitch (an important first step in securing seed money).
Listen to Jessica Jackely articulate the mission of ProFounder in the video and don't be overwhelmed by its length. Skip to the 18 minute mark to get to the good stuff fast.