Social networking allows individuals to build online communities to share interests and activities. Early social networks included SixDegrees.com in the 1990s and connecting "six degrees of separation" between individuals. The rise of the internet allowed for more anonymous interactions and the first recognizable social networks. Today, hundreds of millions of users engage with social networks daily on sites like Facebook and YouTube. While some companies block access due to concerns over productivity, social networks enable new forms of collaboration between employees and with customers. Emerging technologies will further integrate social networks across multiple platforms and devices through mobile access, location-based services, and semantic applications on the "Social Web."