What are some alternatives?
When comparing Fupio and Raddle, you can also consider the following products
Mastodon - Mastodon is a decentralized, open source social network. This is just one part of the network, run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome!
Reddit - Reddit gives you the best of the internet in one place. Get a constantly updating feed of breaking news, fun stories, pics, memes, and videos just for you.
MySocialApp - Seamless Social Networking features for your app
Digg - Digg delivers the most interesting and talked-about stories on the Web right now.
Manyverse - A social network off the grid
4chan - 4chan is a simple image-based bulletin board where anyone can post comments and share images.