AP - Foursquare, the smart phone service that lets you "check in" to restaurants, bars and wherever else you want to tell friends you're at, is trying to help you discover new places.<p><strong>Read more:</strong> <a class="rssreadon" rel="external" title="Check in lately? Foursquare revamps its app   (AP)" href="http://us.rd.yahoo.com/dailynews/rss/tech/*http%3A//news.yahoo.com/s/ap/20110308/ap_on_re_us/us_tec_techbit_foursquare_update" target="_blank">http://us.rd.yahoo.com/dailynews/rss/tech/*http%3A//news.yahoo.com/s/ap/20110308/ap_on_re_us/us_tec_techbit_foursquare_update</a></p>