Linkbacks

(What are linkbacks?)

18 hits: images.google.com, from 1 year ago to 5 weeks ago:
3 hits: images.google.it, from 1 year ago to 1 year ago:
2 hits: images.google.fr, from 1 year ago to 20 weeks ago:
2 hits: images.google.co.uk, from 1 year ago to 1 year ago:
2 hits: images.google.pl, from 1 year ago to 22 weeks ago:
2 hits: images.google.de, from 1 year ago to 26 weeks ago:
2 hits: images.google.com.au, from 19 weeks ago to 5 weeks ago:

Warning: fopen(linkback_debug.log) [function.fopen]: failed to open stream: Permission denied in /home/natetrue.com/domains/nosugref.com/public_html/liblinkback.php on line 9

Warning: fwrite(): supplied argument is not a valid stream resource in /home/natetrue.com/domains/nosugref.com/public_html/liblinkback.php on line 10

Warning: fclose(): supplied argument is not a valid stream resource in /home/natetrue.com/domains/nosugref.com/public_html/liblinkback.php on line 11