The Café uses Classic/Vintage social media 😛
I don't see that analogy on Wiki, nor do I consider them an ultimate authority though on many subjects it helps to capture history.
Forums like Café Saxophone, The Saxophone Museum, The Woodwind Forum, Cox Engines Forum, Stunt Hangar, Motorcycle Forums, The Voyager Association, and etc. are not considered social media. They are specific interest groups. There is limited off-topic discussions permitted in their off-topic thread sections for the sake of socialising and getting to know members better, but it is not the main thrust of discussions.
Their memberships do not consist of anybody and everybody but those interested in the central purpose of their forums.
Social media on the other hand: one does not need to create a topic or participate in one to post messages, although there are threads on topics of interest. It is reverse of "specific interest" forums.
To add, in various social media, one can limit receipt of posts to a circle of previously defined friends with unlimited posting duration. In specific interest forums, there is direct / private messages, but these are limited in scope to addressing a specific topic or issue, thus are narrowly focused, of usually short duration, and a limited specific audience for each thread. Also usually storage space is limited and once these have served their purpose, they are deleted to keep within alotted storage space.