BlindSquare founder, Ilkka Pirttimaa, once browsed over Wikipedia's Augmented Reality article and realized the concept focused solely on vision. Pirttimma believed the concept could expand to audio; thus, the idea for BlindSquare was born. The BlindSquare app provides "a new solution that combines the latest technology to help the daily life of the blind." BlindSquare pulls data from the FourSquare API and alerts users of restaurants, stores, and other locations surrounding them via audio instructions.
Successful Social web sites keep users engaged. One popular engagement feature is Questions and Answers (Q&A), where users can ask questions and experts (or any user) can answer. Qhub, a service that allows you to setup a Q&A section on your site has pushed the envelope by releasing its Qhub API that could enhance your Q&A offering in your application and increase its reach via applications.