In an effort to increase Facebook application distribution, Facebook is making the application directory and application about pages indexable by search engines. According to Facebook’s Akhil Wable,
In an effort to continue providing new ways to distribute your applications, we’re making the Application Directory and app “about” pages available to people who are not logged in. We are also enabling these pages to be indexed by search engines like Google, Windows Live, Yahoo!, etc., so that everyone can discover your applications, not just current Facebook users. In addition to containing information about your applications, a large part of why app about pages are useful is because of what users have to say about your app. So, we’ve decided to allow logged out users to read reviews and the discussion board so that they can get a full picture of what an app has to offer…
The goal of this change is to increase visibility for your applications, so users can find applications that they love using, and you can have more potential users trying your applications. You should start seeing your application about pages in web search results in a few days.
This is a nice way for Facebook to increase app adoption and share a little PageRank love with developers.