What is a Link Shim?

Facebook’s team created “the link shim” in 2008 to protect Facebook users. When you click an external link on Facebook, Facebook’s link shim will check that site against a list of known malicious sites. If the site is known as a malicious site, Facebook gives the user a warning. The link shim also hides Facebook users’ identities when they click external links. The last benefit link shims offer is improving external analytics that can be hurt when you go from a HTTPS site to a HTTP site.

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