[PeterisP]

Not really, Google Knowledge Graph is an ages-old project and the side-panel "fact sheets" have involved manual curation of the automated results.

[nl]

There's manual curation of the schemes which map some human-eneterd data on web pages to facts, but the extraction is automatic.

See [1], noting that human annotation is responsible for 250K of the 100 million high confidence facts in the system.

I believe they have some manual overrides in a few cases, but the system itself is automatic.

[1] https://research.google.com/pubs/pub45634.html