NEW YORK ( TheStreet) -- Popular searches on the Internet Monday include Facebook on news that the social media Web site is opening a software engineering center in New York in early 2012.

Facebook's chief operating officer Sheryl Sandberg revealed at a press conference the company will be adding thousands of employees in the next year, though she did not specify how many of those positions will be added in New York. New York City Mayor Michael Bloomberg attended the press conference.

This will mark the first time the company will have a software location outside of the West Coast. Facebook already has an advertising team in New York, whose location will also be home to the engineers for now. The company has begun accepting job applications.

USPS is trending as the U.S. Postal Service announced changes that will slow the delivery of mail starting in spring 2012.

The USPS is changing the national standard for first-class mail delivery, which is currently one to three days, to two to three days. The Postal Service is making about $3 billion in reductions, resulting in the closing of nearly half of the country's 500 mail-processing centers. The closing of those centers will eliminate the delivery of first-class mail in one day when sent to nearby local communities.

The cost of first-class mail will also be increased by 1 cent to 45 cents beginning in January 2012.

The cuts are all part of the Postal Service's attempt to cut costs and avoid bankruptcy. The closing of the mail processing centers comes on top of the planned closing of 3,700 post offices.

Tokyo Electric Power, or Tepco, is another popular search Monday. The company said more highly radioactive water leaked from Japan's Fukushima power plant over the weekend, some of which may have hit the sea.

The Fukushima nuclear power plant, devastated by the earthquake and tsunami that hit in March, has struggled to manage the aftermath of the disasters since they occurred. Tepco said the water leaked from a desalination unit and managed to get into a gutter that drains into the Pacific Ocean. The total amount of leaked water, which reportedly may have contained 1 million times the Japanese government's legal limit of a radioactive element, could be as much as 11,870 gallons.

Tepco will analyze the water, which is expected to take a few weeks.

The chatter on Main Street (a.k.a. Google, Yahoo! and other search sites) is always of interest to investors on Wall Street. Thus, each day, TheStreet compiles the stories that are trending on the Web, and highlights the news that could make stocks move.

-- Written by Brittany Umar.
Brittany joined TV in November 2006 after completing a degree in Journalism and Media Studies at Rutgers College. Previously, Brittany interned at the local ABC affiliate in New York City WABC-TV 7 where she helped research and produce On Your Side, a popular consumer advocacy segment.