Examples
Some prominent services which were once invitation-based include blog-host LiveJournal, social network Yahoo 360°, and podcast publisher Odeo. When Google releases new services, an invitation requirement has often been imposed for the first few months of the service's existence, including e-mail provider Gmail, social networking service Orkut and real-time collaboration site Google Wave.
Many BitTorrent trackers, known as "private trackers", use an invitation system in order to maintain torrent quality, speeds, and safety. Demonoid and ImmortalSeed are examples of invitation-only trackers. Despite its invite-only status, Oink's Pink Palace was accessed by government authorities and forced to close in October 2007.
Read more about this topic: Invitation System
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“In the examples that I here bring in of what I have [read], heard, done or said, I have refrained from daring to alter even the smallest and most indifferent circumstances. My conscience falsifies not an iota; for my knowledge I cannot answer.”
—Michel de Montaigne (1533–1592)
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—G.C. (Georg Christoph)
“No rules exist, and examples are simply life-savers answering the appeals of rules making vain attempts to exist.”
—André Breton (1896–1966)