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Re:Intro to Yada Project - An Open Source p2p Social Network... by mayank on Tuesday February 01, 2011 @03:48PM (#2167308)
Skype uses a number of super-nodes that provide some guarantees on service level and has a set of central login servers: http://www.mjalali.com/blog/?p=10
Re:Intro to Yada Project - An Open Source p2p Social Network... by pdxwebdev on Tuesday February 01, 2011 @03:58PM (#2167354)
Yes, through mutual friends and indexers with persistent connections, these challenges are mitigated.