Ratings, rankings
Definition:

It is a form of tagging, which allows users of content to rate the quality or usefulness of a particular piece of content. As more users participate, a range of popularity emerges.

Example Usage:

"useful", "not useful", "most frequently viewed" (shows first on a list)

Source: u.a. Frappaolo, Carl ; Keldsen, Dan: Enterprise 2.0: Agile, Emergent & Integrated. In: AIIM Market Intelligence (2008), Nr. Q1, S. 90