You could have downloaded buzzd 1.0 for Mac from our software library for free. The program lies within Lifestyle Tools, more precisely Travel.
From the developer:
buzzd is a location-sensitive city guide and social network on the mobile device. buzzd answers the question, "What's going on around me right now?" by allowing consumers to get up-to-the minute information on what's happening at any venue right now, rate events and connect with frie nds and other people in the area.
You may want to check out more software for Mac, such as NavigX or Mappic Travel Photos, which might be related to buzzd.