at Investor's Business Daily (Tue, 1:34PM)
Yelp (YELP -3.3%) adds to the losses it saw yesterday following's Facebook's Graph Search launch thanks to a downgrade to Underperform from Northland's Darren Aftahi. Aftahi declares Graph Search, which has been lauded by some reviewers, to be "highly competitive to Yelp, as the platform provides a unique alternative to local business search." Of course, people have made similar remarks about Foursquare, Google/Zagat, and a few other would-be rivals.
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