You can get the Facebook Page content by the following URLs:

RSS 2.0

http://www.facebook.com/feeds/page.php?format=rss20&id=[fb-page-id]

Atom 1.0

http://www.facebook.com/feeds/page.php?format=atom10&id=[fb-page-id]

Where the [fb-page-id] could be found by browsing your Facebook Page -> Edit Page. That URL should have the following format.

https://www.facebook.com/pages/edit/?id=%5Bfb-page-id%5D&sk=basic

The above RSS and Atom URLs cannot be used for the Drupal 7 Aggregator module. You can try but the feeds cannot be shown probably. Luckily, i found a website call Facebook Wallflux and they could help you to create a proper feed URL. So the final URL should be in the following format.

http://www.wallflux.com/feed/%5Bfb-page-id%5D

The last thing to do is to enable the Aggregator module and setup the feed @ admin/config/services/aggregator.

Done =)

Reference:

• Facebook Wallflux
• FACEBOOK RSS FEED