There is no magic fairy dust protecting Macs - Dai Zovi, security researcher and co-author of The Mac Hacker's Handbook.
The pictured emails are not real Facebook emails – look at the URLs that are exposed when you hover your mouse cursor over the “sign in” and “reactivate” links.
... this isn't helping, either:
-13- million US Facebook users not using, or are oblivious to, privacy controls
May 4, 2012