I got unlimited access to a website data mining tool. It shows what kinds of IDs the website is using and then identifies similar sites using those same IDs (includes a bunch of IDs and datapoints, like IP address, clickbank ids, authors, amazon product IDs and so on). Here are a few random sample reports I ran with it and some comments. Just post a domain/URL name you'd like to check and I'll request free a report. Warrior Forum Well it looks like they chose to use their own forum to show authorship information. Which kinda clogged the initial part of the report with useless data. They got a DMOZ listing as expected (now that DMOZ is gone, probably not as valuable info), and they also run a second domain webmaster-talk.com. Caught a few affids, OneRelic and One Network Direct IDs. Yawn. Fox News Our fox and friends be runnin a nifty Amazon affiliate program there! Looks like food items are plenty. Also interesting how many domains and subdomains they run. Anyway get a glimpse at what Fox is selling at Amazon, plus some of their other domains and related IDs. Neil Patel Some cross-domains matched. He's probably involved with them in one way or another. John Chow There's probably some useful data in there somewhere, except for all the @jetpack users the Twitter ID matcher crossed. Shoemoney Boooring. And who's Matt Hughes? Anyway, if you want a similar report run for a specific domain / URL, just post it here and I'll run it through my access to this tool.