In late 2011, Facebook said that it would retiring the REST API to focus all of its efforts on the Graph API. Developers had over a year to make the jump, and now Facebook is finally pulling the plug.

Facebook announced today that the REST API no longer available for new apps. Going forward, all new apps on Facebook must use the Graph API. Apps created after April 10 will receive an error code 3 upon trying to call the REST endpoints.

So what does this mean for all the currently existing apps using the REST API? Facebook says those apps won’t be affected, and can continue to use the API. Of course, Facebook would really like it if developers made the jump to the Graph API. If enough developers make the jump, Facebook may even be able to fully retire the REST API so that all apps are on the same page.

If you have yet to make the switch to the Graph API, you might want to check out the stellar improvements and features Facebook has been introducing to it lately. In fact, Facebook just launched a few more Open Graph tools to help make users’ timelines more interesting.

As per tradition, Facebook also released its latest bug report. Since last week, 70 bugs were fixed, and 72 were accepted for further review. You can check out the full bug fix list at the blog post.