If Facebook detects that the clicked link is malicious, then it redirects the user to an intermediate page, which warns the user of the malicious website ahead and gives them the option to return to Facebook: The link is checked against Facebook’s own internal database of spammy/malicious links. Link Shim Tool Checks for Spammy / Malicious LinksĮvery time a user clicks on an external link on Facebook, the Link Shim tool checks whether the clicked link is spammy/malicious. ![]() when a user navigates from an HTTPS to a Non-HTTPS website. To preserve Facebook referrer data esp.To rewrite referrer in order to hide personally identifiable information and thus protect users’ privacy.If yes, then warn the user of the malicious website ahead. To check whether a clicked link is spammy/malicious. ![]() Link Shim is a tool used by Facebook to achieve the following three objectives: So let us start with understanding what these different referrers are and why Facebook generates so many referrers. I discovered 43 different Facebook referrers in the Google Analytics report of the last one year alone. If you have ever looked into Google Analytics with the aim to track the performance of Facebook campaigns, you know that Facebook generates way too many referrers:
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