GeoMeme is a great Twitter mashup that allows users to follow and share real-time local Twitter trends on a Google Map. Created by Bob Hitching, GeoMeme grabs tweets from locations around the world from a variety of iPhone Twitter apps. It then separates tweets from each location into positive tweets on the left-hand side, and negative tweets on the right-hand side. Hitching has plans to incorporate the Twitter Geolocation API into GeoMeme once it’s released, enabling even more tweets to appear on the map.
