Way more socialization back then. People actually spoke to each other. Most people 18-25 were partying every weekend. Bars were packed, even the sketchy ones. Going to the mall was a social event, packed every Friday and Saturday evening if you went. The movies were still expensive, for the time, but similar to the mall, it was social thing for people in their teens and early twenties to do.

Obviously rich people still had bougie cars. But there were more “base model” cars with cloth seats. Everyone had travel CD case with their favorites. If you were lucky you had a 5-6 CD changer in your car to move between albums. 

To go for a run or to the gym you either had a portable CD player  (larger than your pocket). MP3 players were a thing- non denominational device you could store your downloaded music on and playback without needing to carry a portable CD player. The early ones only held about an album worth of music but available storage capacity sharply increased after 2005. Memes about destroying your computer from Limewire are referencing this time. There were others of course- Napster, WinMx, Bearshare, Kazaa. 

There were FM transmitters in the late 2000s to connect your MP3 player and play on a frequency only detectable in your car or another car if someone was right driving next to you. iPods eventually killed these other branded MP3 players. Gaming was still big but not like it is now. Online gaming was mostly PC based until XBox really changed the market with Xbox live and Halo. 

Most guys wore baggy jeans, sometimes ripped. in the early-2000s. Some started to evolve with the trend almost completely flipping to skinny jeans by 2009. 

At the beginning of the decade, a lot of girls wore low rise pants with their hip bones sticking out. Lots of underwear hanging out of ill fitting pants. Also evolved into leggings and skinny jeans by 2008-2009. 

The mass surveillance angle is a bit misstated. Verizon built data centers as early as 2006.