Some stats on adoption

I came across some statistics on linked data adoption some of which may be
interesting to this group.

This is from the perspective of schama.org which is a linked data format
compatible with JSON LD.

https://www.similartech.com/categories/schema

14 million websites using the Blog type

9 million websites using the Person type

While im unsure this constitutes ubiquitous or even  "widespread adoption"
it seems like a pretty good start for a relatively new technology and seems
to be used in about 5% of the websites measured.

This just constitutes the schema.org linked data, there's also facebook
open graph which I believe has in excess of a billion profiles now, even
serving the WebID standard.

I would be interested if there were any other usage stats for technologies
being looked at by this group.  There's a lot of interesting ideas, but
it's less clear how that translates into adoption.  Sometimes there's an
interested technology, but when examined accounts for one user on one site,
which while technically compelling may be less persuasive in terms of usage.

That said, usage is only one part of a bigger picture, but I do think an
overview helps to create that bigger picture.

I know at one time a lot of big firms were interested in adopting things
like FOAF or activity streams or other techs.  It would be great if we had
data points or estimates on where some of these efforts stand in terms of
usage.