Facebook already offers several tools for third party developers. You can use Facebook Connect to make an online community for your website or add a share button for your web pages.
TechCrunch has reported that the company is soon going to offer a Like button that can be added to any web-page on the web.
Visitors would be able to use that button in case they like the content. And it could then be highlighted on their Facebook profile.
Facebook has become very popular as a medium to share your web content online. This new feature would further boost the popularity of Facebook amongst web publishers.