Semantic Web movement has produced several technologies (JSON-LD, SPARQL, OWL, etc) that seem useful for data integration, but they don't appear to have much momentum. I'm struggling to determine if the Semantic Web is a justly abandoned bad idea or a quietly useful mature technology.
The main place I see Semantic Web technology in use is SEO [1] and Email Markup [2]. Is anyone using these technologies for more general data integration tasks?
[1] https://www.bing.com/webmaster/help/markup-validator-e9b66817
[2] https://developers.google.com/gmail/markup/getting-started