Geo-Twitter. Twitter is trying to boost usage by offering “local trends”–lists of tweets bearing popular keywords grouped by region. Initially (by the end of this week) it will consist of “six countries (the United States, Canada, Brazil, Ireland, Mexico, and the U.K.) and 15 cities (13 U.S. cities plus Sao Paulo and London).” Last fall Twitter also acquired a company called GeoAPI that helps developers make effective use of geographic information (http://www.geoapi.com/). See http://tr.im/M2sB