Tech boom. Dot-com bubble. 9/11 attacks. War on terror. Homeland security. AOL Instant Messenger. MySpace profiles. Friendster connections. Nokia cellphones. Motorola Razr. Texting craze. Britney Spears. Justin Timberlake. Reality TV: Survivor, Idol. Lord of the Rings. Harry Potter films.The iPod. Napster piracy. Low-rise jeans. Trucker hats. Facebook’s debut. YouTube.. Digital cameras. MSN Messenger. Xbox and PlayStation. Bush’s presidency. Katrina disaster. Housing market crash. Economic recession. Obama’s hope. Green energy. Arab Spring.