This comment on safer Facebook was received by the [him] moderator.

[him] moderator

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I have followed the Facebook privacy issues closely.  The latest full Facebook privacy is at :
http://www.zdnet.com/blog/igeneration/june-2011-the-definitive-facebook-lockdown-guide/11113?tag=nl.e539

There are several later URLs, mentioning danger of using GPS and several other issues;  here is a later item:

http://www.zdnet.com/blog/btl/facebook-exploring-unfiltered-news-feed-changes/54023?tag=nl.e5

There are many later entries covering issues that the poster has become aware of since that summary.  I would stress for many people receiving HIM that they make sure GPS is not activated in Facebook.