“Discovery” is a hot topic these days. The curse of a new buzzword is that it’s difficult to come to a shared mental model in the early stages. Instead of tackling that large problem, I’ll start with something simpler: defining “social discovery” and suggest that social discovery is a stepping stone on the way to algorithmic discovery.
“Social discovery” has two definitions. On one hand, it’s used to mean services like Highlight that help you to find other people. However, the broader definition is services that help you find just about anything by using recommendations from friends.