Here are some reasons I think FB does well:
- feed statistics: subscribers, item view and clicks
- email subscription: control email template, subscribers
- sharing posts on social networks with FeedFlare
- monitize with Google Adsense
- reduces CPU usage on your host.
Some of above features you can do with plugins, but it costs CPU usage and sometimes host space. With FB, you let FB do all of these stuff without any prices.
FB has its own plugin that redirects WP feed to FB automatically, you can find it in FB.
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