ResearchGate is a network dedicated to science and research. Connect, collaborate and discover scientific publications, jobs and conferences. All for free.
Groovor is an entertaining internet service that enables users to view and rate people's achievements as well as tell about things that make their life unusual.
Laut einer Forsa-Umfrage sind rund 30 Millionen Bundesbürger Mitglied mindestens einer Community. Dabei geht es den Nutzern in erster Linie um Kontaktpflege mit Freunden und Bekannten.