This is a good point in and of itself. While it might be hard to pin down recent fashion and music to specific decades … the use of certain aspects of communication technology has fallen into an interestingly tidy temporal line:
Early 1990s – For all intents and purposes, no Internet – BBSs and such were niche hobbies akin to ham radio. Plenty of beepers but barely any cell phones (for pretty much everyone)
Mid 1990s – The dawn of the ‘popular’ Internet. Usenet is popular among the rising number of people who do go online. Cell phones starting to get used in business applications. Beepers declining slowly.
Late 1990s – AOL, Microsoft, Apple, et al, get the Internet into Average Joe & Jane’s household. Most people get their first e-mail accounts. Chat rooms become a big thing. Yahoo and others familiarize people with the search engine. The rise and fall of Napster. Cell phones explode. Beepers essentially disappear.
Early 2000s – The Internet is fully entrenched into American culture. Google gains relevance as a search engine par excellence. Netflix begins online movie rental. Cell phone texting becomes a thing. Devices like the Palm Pilot and Blackberry are developed.
Mid-2000s – Social media takes root with the emergence of MySpace and YouTube. Wikipedia gains critical mass. Texting is pretty well entrenched. Flip phones become the norm, with sufficient screen size for games, e-mail, and limited web browsing.
Late 2000s – Facebook and Twitter are born, while MySpace nosedives. YouTube celebrities begin to come out of the woodwork. The iPhone and other smartphones are released, gaining cultural traction and market share at a breakneck pace. Blackberries gain their max market share, then begin declining.
2010s – Facebook goes atomic, poised to be the decade’s cultural touchstone as shorthand for “social media pervasiveness”. Instagram and Snapchat blow up. YouTube becomes a legitimate path to ‘mainstream’ fame – either through the online medium itself or after jumping to TV or movies. The touchscreen smartphone revolution is completed – Apple, Samsung, and Google are winners; Blackberry-type devices are losers. Netflix offers streaming content, followed shortly after by original content outside of the broadcast and cable network system. Cable television subscribers “cut the cord” in significant numbers, opting for the (for now) less expensive and more customizable streaming television services.
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And that’s skipping over a lot of other bits of technology that are culturally significant both on their own and through synergy with several items mentioned above. HD TVs, then Smart TVs (introducing many households to streaming TV), and now 4K TVs. Video game systems such as the Nintendo Wii and the Microsoft X-Box that facilitate streaming video. The interior experience of 2010s automobiles is radically different than it was in 1990s cars for sure – back-up cameras, various anti-collision sensors, automatic braking, automatic parking, satellite radio, etc.
In sum: it may just be that what class of things count as significant cultural touchstones differ from decade to decade. So while the 2000s, say, doesn’t have it’s glaringly obvious fashions or music … the decade does instead have its ubiquitous-then-gone technological artifacts to serve as a socio-cultural binding.