The article points to a Facebook patent for an "engagement metric" created at time of posting (that is, before user interaction) which specifically calls out "s

The article points to a Facebook patent for an "engagement metric" created at time of posting (that is, before user interaction) which specifically calls out "state of undress" as a factor to consider: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&d=PALL&s1=8929615.PN http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=H.... ...and this metric is used to determine what gets shown in people's feeds.