The Facebook Shim

This is my second page on the Facebook Shim. My first was that I suspected that links to this and other websites that I run were not being handled by Facebook in a manner that I expected.

It appeared that URLs that were placed in Facebook posts were not allowed to be pointed to my websites without some measure of obfuscation. This obfuscation was unclear to me at first but I concluded that the Facebook user was either not presented with the base URL and it was stipped from the post automatically and a warning was displayed that Facebook could not verify that the URL was not a trusted one.

On further investigation it was still not clear. However, any attempts to place a URL in a Facebook post resulted in a waste of time. For this reason I decided to develop my own "shim"

August 2024, I made another search after seeing some accesses to my first page on the shim. It seems that I was correct in assumptions. The explaination below is actually quite interesting as are some of the comments on the post.

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To be fair, Facebook are being "transparent" about this technique.

The Facebook Site Integrity Team

" As a member of the Site Integrity Team at Facebook, my primary goal is protecting users from spammy or malicious content. The Site Integrity Team has built a bunch of powerful tools over the years to help us in this fight. One of our most important tools is a system we call "the link shim," which has been around since 2008. This is how the link shim works: every time a link is clicked on the site, the link shim will check that URL against our own internal list of malicious links, along with the lists of numerous external partners including McAfee, Google, Web of Trust, and Websense. If we detect that a URL is malicious, we will display an interstitial page before the browser actually requests the suspicious page.
This interstitial page serves a number of purposes, including: (I have summarised here)

  • Protecting People
  • Protect Privacy and Identity
  • Enable More Accurate External Analytics
  • plus others
The Interstitial Pop-up

I cannot see how my sites would be deternined as "safe" as they are not likely to be identified by any of their checks as I am just not that popular. It is only natural for Facebook to assume that I am "hostile". In any case, it stops their users being able to promote anything for free.

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External Links - references

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