It's not a new component of Bing (not yet, anyway), but Microsoft has taken the wraps off a new small-scale search project at its TechFest event this week -- one with a particular focus on so-called viral content. Appropriately dubbed ViralSearch, the effort from Microsoft Research currently uses Twitter as a source for all its data, and offers a variety of ways to track and visualize how a story, photo or video spreads from one outlet or individual to hundreds or thousands of others. That includes a profile view of sorts, which lets you see how influential a particular person was in spreading an item, and how prolif