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If you receive such a mail, DO NOT click links to the following sites:
goldbase.be
greenbuddy.be
silvertag.be
picoband.be
As we saw with Twitter's Mikeyy attacks, these scams are particularly effective at weekends because the websites have less staff on hand to deal with them.
What To Do
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If you receive one of these Facebook mails, simply delete it - one of your friends is infected but not you. If you find, however, that your account is sending the mails:
1. As a precaution, go to your browser settings and clear your cookies.
2. Change your Facebook password