Anttenna – Mobile MicroListings
http://www.anttenna.com/

Anttenna is a free mobile application that facilitates real-time, location-based, person-to-person exchanges. By turning traditional classified listings into geo-tagged twitter sized microlistings, Anttenna lets you quickly connect with people nearby. Got an extra ticket? Need an extra ticket? Lost your dog? Having a yard sale or an open house? Just post a quick mobile microlisting. YThis has been adde dto the tools section of Research Resources Subject Tracer™ Information Blog. This will be added to eCommerce Resources Subject Tracer™.