
Warning: Facebook Buttons May Be Hazardous to Your Site's Health
The problems are apparently 1) too many page visits shown, and 2) creation of duplicate content on all search engines that find the link.
It is not a problem for me, so I'm not going to research further.
This article posted on AuctionBytes goes into a bit more detail about the problem:
"If there's one thing that makes online sellers and marketplaces happy, it's an increase in traffic on their website - unless it's caused by a bug that has the potential to harm the website's ranking in Google."
Warning: Facebook Buttons May Be Hazardous to Your Site's Health
Marvin
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