I have started off by reading Displaying Facebook posts to non-Facebook users which is of some use but I cannot believe it is this difficult to get a public feed from Facebook.<
I have some success with reading in the direct feed without tokens etc. (using magpie, simplepie or querypath or similar).
http://www.facebook.com/feeds/page.php?format=rss20&id=........ http://www.facebook.com/feeds/page.php?format=atom10&id=........
found on: http://ahrengot.com/tutorials/facebook-rss-feed/