Foursquare

American Express in alliance with foursquare announced the national rollout of their new service following a successful pilot at South by Southwest in March. The service allows American Express® Cardmembers who link their foursquare profiles to their cards to “load” and seamlessly redeem merchant Specials without the need for coupons, special codes, or showing their mobile devices to cashiers.

Facebook unveiled its latest location-based service Facebook Places. The new product features much of the functionality provided by existing services such as Foursquare and Yelp.

"This is going to be a really fun and interesting summer," said Facebook CEO Mark Zuckerberg at the start of the evening. "We've got a lot of new products coming out."

Facebook Places is designed to do three main things:

According to some sources familiar with the deal, Yahoo is in talks to purchase location-sharing service Foursquare for $100 million.

As it became known Foursquare CEO Dennis Crowley has spent the last several days meeting with companies including Apple and Facebook. But Yahoo has shown the strongest interest.