David Kedmey and Xiao-Ping (Steven) Zhang take home the top prize. EidoSearch is the grand prize winner of the Alpha Exchange Innovation Campaign, presented by Backbone. The company was chosen from a field of strong candidates at a live-pitch event May 15, held during the OCE Discovery 12 show in Toronto.

Even those marketers with exceptional social-network-savvy can struggle to keep up with the latest developments in leading social media. Acquisitions, new features and new platforms are a daily occurrence, and it can be easy to get lost in the sea of updates in the social world. Similarly, it can also be easy to lose sight of which are actually of benefit to your business.

This week the leading location-based service Foursquare announced it had achieved 20 million users. Despite the milestone, critics were quick to point out that check-in services were dead. Over the past few months other major check-in based services such as Loopt, Gowalla, BrightKite, and Facebook places have shut down or been acquired and closed.