Led Zeppelin reunited for the one-off Ahmet Ertegun Tribute Concert at The O2 Arena in London. According to Guinness World Records 2009, Led Zeppelin set the world record for the "Highest Demand for Tickets for One Music Concert" as 20 million requests for the reunion show were rendered online. Internet Prominent websites and apps launched during the decade were Wikipedia (2001), Google Earth (2001), Internet Archive (2001), iTunes (2001), MySpace (2003), 4chan (2003), Facebook (2004), Flickr (2004), Mozilla Firefox (2004), YouTube (2005), Google Maps (2005), Reddit (2005), Twitter (2006), Google Chrome (2008), Spotify (2008), Waze (2009). Wisdom of the crowd – during the decade, the benefits of the "Wisdom of the crowd" are pushed into the spotlight by social information sites such as Wikipedia, Yahoo! Answers, Reddit and other web resources that rely on human opinion. Fashion Fashion trends of the decade drew much inspiration from 1960s, 1970s and 1980s styles. Hair styles included the bleached and spiked hair for boys and men and long and straight hair for girls and women continued, as well as many other hairstyles from the mid-late 1990s. Kelly Clarkson made chunky highlights fashionable in 2002 on American Idol and lasted until about 2007. Both women and men highlighted their hair until the late 2000s. The decade started with the futuristic Y2K fashion which was built on hype surrounding the new millennium. This dark, slinky style remained popular until 9/11 occurred and casual fashions had made a comeback once again. Baggy cargo pants were extremely popular among both sexes throughout the early and mid 2000s until about late 2007. Bell-bottoms were the dominant pant style for women until about 2006 when fitted pants began rising in popularity. The late 1990s-style baggy pants remained popular throughout the early 2000s, but by 2003 boot-cut pants and jeans became the standard among men until about 2008. The 2000s saw a revival of 1980s fashion trends such as velour tracksuits in the early 2000s (an early 1980s fashion), and tapered pants in the later years (a late 1980s fashion). Skinny jeans became a staple clothing for young women and men. By 2009 with the Jerkin' movement playing a large part in the popularization of skinny jeans. Mass brands Gap and Levi launched their own lines for skinny jeans. Throughout the early and mid 2000s, adults and children wore Skechers shoes. The company used many celebrities to their advantage, including