Social media tools include Facebook, LinkedIn, Twitter, Flickr, and YouTube. Facebook allows users to connect with friends and share updates. It has over 300 million active users, many outside the US. LinkedIn is a professional networking site with over 50 million users that allows users to create resume-like profiles. Twitter allows users to share short messages and see updates from followed accounts. Flickr is a photo sharing site hosted photos. YouTube is a video sharing site where users can view, comment on and share videos. These tools can help organizations engage audiences and monitor discussions.