Facebook Does Something New: L.Facebook.com and LM.Facebook.com

We just noticed a new referral source in our Analytics data. In the past we have seen two referral sources from Facebook – plain “facebook.com” and mobile “m.facebook.com.” Just in the past few days we’ve noticed two new ones – “l.facebook.com” and “lm.facebook.com” – and we’re not completely sure what they are yet. From what…