What are traffic sources l.facebook.com and lm.facebook.com I am seeing as referral traffic in google analytics?

I am seeing new referral traffic in google analytics from l.facebook.com and lm.facebook.com.  Anyone know what this is and how it is different from regular facebook traffic?
PrecisionAsked:
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Brandon LyonSenior Frontend DeveloperCommented:
I believe L dot is an anonymized source ( someone who shared a link privately ) and LM dot is the same, but from a mobile device.
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Jessica MatthewSenior Manager, Product MarketingCommented:
To elaborate on Brandon's answer a bit more:
Referral traffic from l.facebook.com or lm.facebook.com are from facebook users clicking on sponsored shared links.
The difference is: l.facebook.com is when someone clicks a shared link from facebook desktop (or on a device in desktop mode) and  lm.facebook.com is when someone clicks a shared link from the mobile Facebook version (m.facebook.com).
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