AreaFace is a reverse Google Map mashup. Instead of taking your friend/follower list and placing them on the map, you click the map down to any area and it gives you the recent Twitteres that list themselves in that location/area. A great way to find more people using Twitter around you.
You can also search for keywords and trends to find locals (or wherever) talking about a topic that interests you. I tested some and found some new poeple to try and follow.
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Filed under: Location services, AreaFace, location