Invitation system
In relation to websites and other technology-related organisations, the term refers to a more specific situation whereby invitations are sent, but there is never any approval needed from other members.There are a growing number of sites which use invitation systems on a permanent basis to create exclusivity and to control quality of user-generated content.[1] Rarely, they may be used on a permanent basis in order to aggregate social network statistics (all users will ultimately have a traceable connection to all others).Some prominent services which were once invitation-based include blog-host LiveJournal, social network Yahoo 360°, and podcast publisher Odeo.Despite its invitation-only status, Oink's Pink Palace was accessed by government authorities and forced to close in October 2007.