In Thursday's Analysts' Actions, Yelp (YELP) gets hit with three downgrades, while Staples (SPLS) and Buffalo Wild Wings (BWLD) receive a thumbs up from analysts. It's an ugly morning for Yelp. RBC Capital downgraded the company to SECTOR PERFORM from OUTPERFORM, following its disappointing first quarter earnings results and weak outlook. Yelp also had its rating lowered at Bank of America and Sterne Agee to NEUTRAL from BUY. Staples, on the other hand, got an upgrade to BUY from HOLD at Jefferies with a $20 price target. The firm believes Staple's acquisition deal of smaller rival Office Depot (ODP) is 'likely.' And, Buffalo Wild Wings receives a couple of upgrades by analysts at Robert Baird and Miller Tabak. TheStreet's Kurumi Fukushima reports in New York.