I sometimes use Goodsearch.com, as it apparently donates a part of the advertising revenue to charity. Regardless, sometimes I see really odd behavior that results from non-commercial sites like
.edus and even Wikipedia appearing as sponsored results. Does Wikipedia advertise to drive revenue to their sites? If not, who is sponsoring (i.e. paying) to drive visitors to Wikipedia and other apparently non-commercial sites? In the screenshot below a number of results are from Wikipedia. Or is it Yahoo or Bing trying to get a larger share of visitors going through them?