Just did some further looking ...
Sorry, gang .. it’s apparently another ridiculous hoax:
“However the claims in the message are total nonsense. There is no virus like the one described in the warning. In fact, the message is nothing more than a Facebook flavoured variant of a tired old virus hoax that has circulated via email since 2006. As the following example of the 2006 email version reveals, the two are clearly woven from the very same cloth:”
http://www.hoax-slayer.com/invitation-fb-virus-hoax.shtml
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“Analysis: No such virus exists. This is an updated version of a well-known hoax circulating since 2003, the ‘Invitation’ Virus Warning. Apart from the addition of the word “FACEBOOK,” the new text is virtually identical to the older one.
Indeed, there are many versions of the same hoax in circulation. Here are a few examples:
• ‘Invitation’ or ‘Olympic Torch’ Virus Warning
• ‘A Virtual Card for You’ Virus Warning
• ‘Black in the White House’ Virus Warning
• ‘Osama bin Laden Hanged’ Virus Warning”
http://urbanlegends.about.com/od/facebook/a/Invitation-Facebook-Virus.htm
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I was tired and didn’t do my usual checking .. will do so in the future .. and I HATE Snopes.