Hypothesis
Authored by:: Brendan Langen
Hypothes.is allows users to annotate webpages or documents in their margins, providing the option to further enrich a snippet with context. Sharing is built in to Hypothes.is, affording added context and active reading across groups.
This enables social tagging, which helps users find related content and build community. Social tagging is a key user behavior to managing a decentralized knowledge graph. This can come in the form of text, likes or emoji reactions.
In an exciting development, the W3C Web Annotation recommends expanding upon their functionality by binding annotations to specific subregions of PDFs, which would enable interoperability beyond the tool alone.