Yelp's platform is generating over 10,000 food orders a week

"Yelp reported significant revenue growth vs 2012. The company announced $70.7 million revenue for Q4 2013. That represented 72 percent growth vs. the same period a year ago. For the full year, Yelp said that revenues hit $233 million, compared with $137.6 million in 2012.
Other numbers presented today:
53 million total reviews (30 percent of new reviews can from mobile devices)
120 million monthly uniques
53 million mobile uniques
67,000 active local business accounts
The company also said that the Yelp Platform is “now generating over 10,000 food orders each week.” For Q1 2014 the company expects to make between $73.5 million and $74.5 million. Full year 2014 revenues are projected to be $353 million to $358 million."

Source:  Yelp's Q4 2013 results, reported on the Screenwerk blog, 5th February 2014