No, you can say, "There are FE groups on other social media sites, however they are not DISboards FE groups". You can't direct others here to specific social media sites. But you can acknowledge generally that there are some.
I'll just point out that FE groups started on DISboards, and were handled for years on just this site. Only recently have people on other sites (who set up their own groups) have been, basically, saying "come on over to our site", pretty much gutting the DIsboards groups.
On my first cruise that I did the FE exchange, I was in two different groups on two different cruise sites. Each was separate, although there were a few of us who were on both sites. No reason FE groups can't be done on other sites, but they are separate entities from a DISboards FE group.