It’s been a busy week for Facebook, announcing a number of small changes and launches. Individually none of them seems like that big a deal, but together they paint a picture of a huge strategic focus on mobile.

Behind all these decisions there seems to be an underlying goal of making money off those fast-growing mobile users. Facebook's plan: to turn its mobile app from an afterthought to the website, into a true stand-alone, profitable service.

Thursday night, Facebook launched an “App Center” with 600 social apps. Facebook will offer users custom recommendations for apps, based on what apps they and their friends already use. By promoting the best apps, Facebook wants to encourage developers to work on Facebook’s platform—rather than just focusing on the popular Apple iOs and Google Android platforms. Easier access to more, better apps will hopefully lure Facebook users to engage more on the apps—which means more opportunities to show them ads.

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