Social media has existed since the 1950s in various forms like phone phreaking and bulletin board systems, but became more prominent with services like Geocities, AOL Instant Messenger, and later Facebook and Twitter. The US has over 240 million internet users, 98% of whom use social media. Sites like Google, Facebook, and LinkedIn each see millions of daily users. Social media allows for inexpensive advertising and networking compared to traditional media. It can increase brand awareness, link popularity, and search rankings by leveraging consumer generated media.