1script - 1:49 am on Mar 4, 2013 (gmt 0)
@motorhaven: thank you for the tip! I did not know about it and I have to admit: I was blocking (403) proximic for the longest time, at least for the last two years, since they were such a prolific crawler. They gobble up MORE URLs than Googlebot, which in itself is not a small portion of the server load. But if there's a good use for them, and sounds like there is, I will have them un-blocked and see what happens with the AdSense which is being used on some of the sites.