I've been using the Wikitree consolidated tree in my initial contact email to triangulated groups. You get to that tree by (from your home page) going to the 'Family Tree & Tools' tab, then clicking on the 'Compact Family Tree' link. That brings up a terrific 8-generation family tree. Copy the IP address and then paste that into the email you send.
I was just recently asked by a 'new cousin' why I sent people to Wikitree as opposed to my ancestry.com tree. I told him that it was a more user friendly tree and informed him of the DNA features available with Wikitree. He loved the idea and planned to join.
Many of my matches aren't on Gedmatch. I have a lot of triangulated groups from FTDNA. As such, there's no ID # to provide. And the majority of them aren't on Wikitree either. So I can't link to their names. Additionally, I share different segment lengths with different people (with different start/stop points), as they do with one another. So I don't put the segment lengths or start/stop points on my citation. I have started listing the chromosome, although I've got segments on multiple chromosomes that trace back to the same MRCA.
http://www.wikitree.com/wiki/Barnard-1255 (Mary India Barnard) has the following three paragraphs under a DNA heading:
Several people have matched DNA and are part of a triangulated group that traces their ancestry to William Snell and Martha Dorminy. The triangulated group includes (as of 6 June 2015) three descendants of Lewis Daniel Snell and Mary India Barnard. One of them descends from Verlie, one from her sister Anna, and one from her sister Myrtle.
Maternal relationship is confirmed by four descendants of Sarah (Mary India's great-grandmother) matching their mtDNA. Two of these people descend from Sarah's daughter Nancy and two descend from Sarah's daughter Alcey.
Paternal relationship is confirmed by descendants of William Stroud Sr. and Margaret Rose (from whom Mary's father descends). Several people are sharing a segment on chromosome 9. (Posted by Darlene Athey Hill, who you may contact for additional information.)