Thanks for the explanation. I did find in my searches a big-league connection with UK Facebook but litle or no mention outside of that.
For me it happens only when visiting Yahoo. I do reset Camino at least daily, usually after Yahoo misbehaves. Have not signed into Facebook in a very long time, have Flash Cookies disabled, so at least in this case the connection seems to be with the Yahoo server not Facebook.
As you say it does not appear to be malicious but it is certainly annoying.
Do NOT Touch this computer!!! Touching this computer WILL cause irreversible brain damage.
It's Un-Canadian to oppose a warming trend.