The twitter account DMTNexus is setup by me a long time ago to prevent the name claiming, it didn't work though as we can see now.
As for the facebook DMT Nexus, the "DMT Nexus" is bad and the "DMT-Nexus" is ours (notice the - and the empty space), our account is normally disabled but I've activated it now to claim copyright infringement with facebook.
The best step now is that we all report this fake facebook account as what it is: fake. The more people who will do that the faster it will disappear.
For the twitter account I will make a DCMA claim for copyright infringement and impersonation. I will also do that with the facebook account if our reporting doesn't work fast enough.
Kind regards,
The Traveler