Google is throwing significant muscle into its new focus on local businesses: It has acquired reviews behemoth Zagat for an undisclosed sum, the company said Thursday.

"[Zagat's] iconic pocket-sized guides ... were 'mobile' before 'mobile' involved electronics," Marissa Mayer, Google's head of local and location services, wrote in a blog post announcing the deal.

Zagat, founded in 1979, rates restaurants on a 30-point scale based on consumer surveys and reviews. Its guides include short paragraphs culled from those reviews, and it operates in 13 categories and more than 100 cities.

Read the full story: "Google buys Zagat in push for local market"

Move over, Mickey D's, and bring Ronald McDonald with you - there's a new fast food king in town.

Subway has surpassed McDonald's to become the world's largest restaurant chain in terms of units, the sandwich company confirmed Monday.

Subway had 33,749 restaurants around the globe at the end of 2010, said company spokesman Les Winograd. McDonald's had 32,737 at year end, according to a February regulatory filing from the burger giant.

"Last year was actually pretty average for us, growth-wise," Winograd said. "We aim to open between 1,000 and 2,000 locations globally each year."

As of Monday, Subway has 34,218 locations globally - all of which are owned by franchisees.

Read Subway beats McDonald's to become top restaurant chain