Twitter has acquired Mixer Labs, creators of “GeoAPI,” that allows developers to add geolocation features to their apps, and now it’s going to help Twitter advance its location-based capabilities. “GeoAPI is a comprehensive service for helping developers build geolocation-aware applications. As of today, they’re part of Twitter and will be working to combine the contextual relevance of location to tweets. We want to know What’s happening?, and more precisely, Where is it happening? As a dramatic example, twittering “Earthquake!” alone is not as informative as “Earthquake!” coupled with your current location. We’ll be looking at how to integrate the work Mixer Labs has done with Twitter API in useful ways that give developers behind geo-enabled apps like Birdfeed, Seesmic Web, Foursquare, Gowalla, Twidroid, Twittelator Pro and others powerful new possibilities,” announced.