In my brief experience holding this stock and trading in and out a few times since January 13...these 15-20% (and higher) run-ups typically re-fill gaps. Also, the stock peaks early in the first 2 hours and sells off last hour, regardless of market conditions. One big problem with holding YELP (long) is competition from FB and GOOG...even a small news article or opinion which infringes on yelp's review systems can swing the stock down. Saw it come up 10% on a single day and retrace 15% over the 2 next trading days after at least twice.
I still think YELP can peak at 35-40 in this overvalued market...BOL.