I read the LinkedIn v2 API half the day, but couldn't wrap my head around what exactly is the distinction between a Share and an Activity?
When I fetch shares via https://api.linkedin.com/v2/shares, I get objects having a share id / urn (e.g. urn:li:share:6432959801428316160) and an activity urn (e.g. urn:li:activity:6432959801868713984). For both urns I can fetch the same like/comment count via https://api.linkedin.com/v2/socialActions.
The activity urn is described as "Urn of the activity associated with this share", but I couldn't find in the docs what exactly an activity is, in particular compared to a share.