Social media has revolutionized communication through smartphones and apps. Entrepreneurs launch startups with little funding initially, then seek angel investors or go public. Crowdfunding is a new way for startups to get small investments online without giving up control. Social media is big business, as shown by Facebook's success in generating ad revenue. It has also lowered barriers to entrepreneurship and monetizing ideas. However, mobile and social media raise privacy concerns around geotagging that may evolve over time.