Now that we can search by image on Google and see every site that is using the same photo, I assume that Google is going to use this as a signal for ranking as well. Is that already happening? I ask because I have sold many photos over the years with first-use only rights, where I retain the copyright. So I have photos on my site that I own the copyright for that are on other sites (and were there first). I am not sure if I should make an effort to remove these photos from my site or if I can wait another couple years.