Yeah, they've been looking into mermaid related stuff on pinterest since August last year. As far as community related stuff that I recognise there are Mermaid Cydney's shell bras and FreshWater Mermaid's leg/thigh scale tattoo.

So to go from them to find out about Mernetwork and well known tailmakers is not a big stretch. Particularly since the 'company' has only been around since January.