Aggregift
http://aggregift.com/Crowdfunded gifting
Aggregift enables users to participate in crowdfunded gifts for friends and to easily share those gifts via Facebook or Twitter, prompting others to participate and share as well. Our platform also serves as a way for retailers to convert social media spend into product sales, build direct relationships with customers, and natively advertise products to our users' friends.
Angel list: https://angel.co/company/aggregift
Member count: 1-10