In addition to appliance manufacturers exploring smart/wifi-enabled devices, there are now products that allow you to trigger physical switches wirelessly! https://microbot.is/push/
Reviews are very mixed, but with hindsight this class of device was inevitable.
miniblog.
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Slashdot is the only community site I've seen where you can vote comments along multiple axes (insightful, interesting, funny).
It's really useful metadata: jokes are inevitable, so rather than having rules about them, let the site order comments appropriately.
https://www.unfitbits.com/ is a website entirely devoted to gaming fitbits! It was probably inevitable given the reward systems available.
MediaWiki templates are Turing-complete! Perhaps it was inevitable. http://t.co/YCVvALNTDu