Well, Yelp (CrunchBase info on Yelp) has now copied the checkin gesture that Foursquare (Crunchbase info on Foursquare) introduced to us all and also they added badges of their own. I already am the baron of my favorite Mexican restaurant in Half Moon Bay.
This copying behavior demonstrates to me that Yelp is definitely jealous of the attention Foursquare is getting and isn’t able to innovate on its own.
This seems to be a problem for Foursquare. But is it really?