(What are linkbacks?)

3901 hits: stumbleupon.com, from 1 year ago to 3 weeks ago:
... Your page is now on StumbleUpon! For each appearance in your referral logs, one of our members has ...
15 hits: images.google.com, from 1 year ago to 3 days ago:
... Your browser does not support frames. Google uses frames to display image results. You can view the referring page for this ...