PayPal has announced a deal to offer its services in key parts of Facebook’s advertising and developer systems.

As part of the new relationship, advertisers around the world will soon be able to use PayPal to pay for Facebook Ads through the company’s online advertising tool.

PayPal indicates that its service will make the process easier for advertisers, particularly small international companies, to run campaigns on Facebook.

“We want to give the people who use Facebook, as well as advertisers and developers, a fast and trusted way to pay across our service. As our business has grown, offering local methods of payment has becoming increasingly important for advertisers who want to buy Facebook Ads. Teaming with PayPal, a global leader in online payments, makes this possible,” said Dan Levy, director of payment operations for Facebook.

Facebook was the number one global social networking destination in December 2009, with 206.9 million unique visitors and 67% of global social media users visiting the site in that month.

As a part of the deal, PayPal will become a payment option for Facebook Credits, which is currently being tested in a small number of games and applications, allowing users to purchase virtual goods on Facebook, including items from the Facebook Gift Shop.