In a period of 41 seconds on December 21, this site got hits purportedly following links from 75 different pages on scholarsandrogues.com, 21 on russia-insider.com, 21 on www.africaresource.com, 21 on irwinvillagetourzjamaica.com, 20 on jaykeating.com, 18 on *.ox.ac.uk, 17 on www.zylstra.org, 16 on www.nobleprog.de, 13 on ciaplescounreds.me.pn, and 10 pages on 5 other sites.
And then in 33 seconds on December 26: 57 pages on blog.tcmpage.com, 21 on worldpeace.org, 20 on faoumonso.strefa.pl, 14 on hudepajuw.inmart.asia, 13 on www.greendirectory.com, 11 on amary.site90.com, 9 on piratebox.site, 8 on www.strangehistory.net, 8 on masini.00author.com, 7 on lints.atwebpages.com, and 63 pages on 38 other sites.
No site appears in both of these clusters. Some are obvious spammers; some are genuine blogs; fourteen are small Picasa galleries, with no outgoing links.
The requests came from 99 different addresses; again none are in both clusters.
Later: When I finished examining my referral log for December, I decided it’s no longer worthwhile, particularly since Google usually doesn’t tell me what the search string was.