And last, but not least, we're seeing a sort of mass hysteria sweeping our culture which is really quite disturbing.
Thus we can not say that these periods were necessarily "global".
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Bowman, Ned Kock, Paul Cairns, Stephen Few, Kerstin Dautenhahn, Fabio Paterno, Dianne Cyr, Richard Mortier, Hamed Haddadi, Tristan Henderson, Derek Mc Auley, Jon Crowcroft, Andy Crabtree, Constantine Stephanidis, Pieter Stappers, Elisa Giaccardi and Ann Blandford Online services such as Linked In and Craigslist want to show users all of the functionalities they offer.
It helps in getting first-time visitors interested and convincing them to engage and contribute.