Yelp.com has announced a partnership with Telmetrics (more) to provide call tracking services to its advertisers.
From the press release (PDF):
Yelp, which receives more than 45 million monthly visitors and has more than 16 million reviews, will use Telmetrics’ call tracking solutions to help measure the volume of phone calls the site is driving to Yelp-listed businesses.
That Yelp would begin offering call data to its advertisers should come as no surprise. Internet Yellow Pages (IYP) sites have been doing so for years.