Powering some of the most important flash apps on social sites, Userplane is a big player in the social networking and dating scene.  They offer three crucial applications that drive some of the most popular social sites out there.
The application suite consists of three Apps that each add
core, [...]

If you are looking to try out a new search engine, RawSugar promises great things.  From user-tagged searching, to RSS feeds of searches and tags, the team at RawSugar hopes to impress today’s social visitor.
Here’s one of their more interesting developments:
RSS feeds for any tag or combination of tags using the same URL conventions:
   1.  [...]