1) The document discusses the use of semantics and semantic web technologies in both enterprise applications and on the public web from 1999 to the present.
2) Key applications mentioned include semantic search engines developed in 1999-2001, an active semantic electronic medical record, fraud prevention at global banks, the BBC Sound music index, and social media analytics tools that extract and query semantics from tweets.
3) The emergence of large linked open data sets starting in 2010 and ontologies like Schema.org and GoodRelations are also summarized as important developments for the semantic web.