Patrick Salyer doesn’t work at Facebook. He doesn’t own any of its stock. But he’s one of thousands of entrepreneurs in Silicon Valley and around the world who stand to make a lot of money when the Menlo Park social network goes public later this year.

Salyer, 30, is chief executive of Gigya, a Palo Alto startup that helps clients such as Nike and Home Depot reach customers via their Facebook accounts. He said Facebook’s filing Wednesday to go public — which unveiled a trove of data about the company’s revenue and customer growth — will be “a wake-up call for businesses” to step up spending on social media and benefit companies like his.

The number of startups that have sprung up in recent years to make money via Facebook’s platform easily runs into the tens of thousands, said Steve Garrity, co-founder of Hearsay Social. The San Francisco company helps big brands like 24 Hour Fitness manage relationships with customers using social networks.

ABC News’ Michael Falcone reports:

Donald Trump will endorse Mitt Romney in Las Vegas on Thursday, sources familiar with the decision tell ABC News.

A political aide in Trump’s office spoke directly with Mitt Romney by phone last night before Trump’s private plane took off from New York City to Las Vegas, according to a source familiar with the discussion.

The call was to inform Romney of Thursday endorsement, which will take place at a 12:30 p.m. event at the Trump International Hotel on the Las Vegas strip.

A contracting company used by the Romney campaign has been setting up for the event since last night.

Sources familiar with Trump’s say that earlier reports of a Gingrich endorsement were inaccurate.

ABC News’ Jennifer Wlach contributed reporting.

Washington- General Motors extended-range electric Chevrolet Volt had its worst sales month since August, as negative publicity over fire risks hurt vehicles sales in January.

GM sold just 603 Volts – above its sales in January 2011, but far below GM’s best-ever sales month in December, when GM sold 1,529 Volts.

Last week, GM North America President Mark Reuss said sales of the Volt have been hurt by bad publicity.