https://www.theregister.co.uk/2018/06/11/facebook_and_snap_look_to_jam_blackberry_patent_suit/

Facebook and Snap are pushing to have the patents behind Blackberry's massive infringement suit invalidated and thrown out.

The two companies last week both filed (PDF) motions to dismiss their respective cases on the grounds the four patents cited by Blackberry in its complaints were invalid for use in court.