I'd say (mass market) social media - that's basically when Facebook become nearly universal, and replaced a bunch of competing / regional social media networks,

I'd say (mass market) social media - that's basically when Facebook become nearly universal, and replaced a bunch of competing / regional social media networks, and also the rest of FANG becoming massive and dominant. It's also when "the internet" and "computers" stopped really being about networking, information processing, getting work done, etc inside some traditional organization, and basically about advertising, marketing, retail.