lm.facebook.com
Facebook link redirect (mobile)
What it is
The mobile counterpart of l.facebook.com. Facebook pages served to phones link out through lm.facebook.com/l.php?u=<your URL>, which then forwards the visitor.
Why there's no full URL
The referrer is Facebook's redirect page, not the post the person was reading. Facebook does this to keep the source page private.
What traffic it represents
Clicks on links to your site from Facebook in a mobile browser.
Sources
We still need to let the websites you navigate to know the traffic is from Facebook, but we also want to prevent them from reading the full source url.
A faster, better link shim - Engineering at Meta
https://lm.facebook.com/l.php?u=https%3A%2F%2Foptout.aboutads.info%2F
Facebook mobile page source (checked 2026-10-06; Facebook sometimes serves a login page instead)
Related referrers
android-app://com.linkedin.androidLinkedIn app on Androidandroid-app://com.reddit.frontpageReddit app on Androidandroid-app://com.twitter.androidX (formerly Twitter) app on Androidandroid-app://com.google.android.youtubeYouTube app on Androidl.facebook.comFacebook link redirect (link shim)l.instagram.comInstagram link redirectt.coX (Twitter) link shortenerlnkd.inLinkedIn short linkwww.linkedin.comLinkedIn websitewww.youtube.comYouTube (via youtube.com/redirect)news.ycombinator.comHacker News
Referrers, grouped by how people arrived
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