Local review site Yelp is getting into the daily deals business--and going head to head with Groupon--and has chosen San Diego as its first beachhead into the market. According to Yelp, it has begun offering local deals in San Diego as an expansion into the daily deals market. Yelp said it has begun offering special deals in San Diego--this week, from The Little Yoga Studio--to its users, as it starts testing deals in markets like San Francisco and New York. Yelp is based in San Francisco, and Groupon is based in Chicago. The two firms are among dozens of companies trying to make their market in offering up daily deals to consumers.