Facebook. Openid. Proximity. Social Media Landscape > FredCavazza.net. Did you notice that the « Web 2.0 » term was outdated?
One can say that after months (years?) Of overselling the « 2.0” » stuff, it begins to fade. Is There a Reverse Network Effect with Scale? - ReadWriteWeb. The Internet economy has been built on the network effect (i.e. the effect that one user of a good or service has on the value of that product for other people).
Investors and entrepreneurs have treated this like Moore's Law. But just as Moore's Law hits physical constraints, network effects have a limit in many types of online communities. Indeed, in some cases, a reverse network effect may exist: as new people join, others are motivated to leave.