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StumbleUpon , the discovery engine that enables its users to "Stumble" onto personalized web content, unveiled a major redesign Monday, introducing a slew of upgrades that include a streamlined interface, recommendation improvements, and the addition of brand channels.

Foursquare gets hundreds, if not thousands, of brand requests every week. Here's how to forge a partnership with the in-demand service, and to reach customers who might get lost in the shuffle on Facebook or Twitter