The foaf:workInfoHomepage of a foaf:Person is a foaf:Document that describes their work. It is generally (but not necessarily) a different document from their foaf:homepage, and from any foaf:workplaceHomepage(s) they may have.

The purpose of this property is to distinguish those pages you often see, which describe someone's professional role within an organisation or project. These aren't really homepages, although they share some characterstics.