Scrapers generally, sure. Not sure about scrapers on other social-media sites like Facebook, though.

The question being: if just having access to the network isn't enough to grant you access to the data of a specific profile, but instead you have to aggregate samples from a bunch of people in the network in order to see "through their eyes" to the data on the profiles of their friends and friends-of-friends, is that allowed?

Because, if even that was allowed, that'd surely open a different kind of floodgate.