"LinkedIn is a professional network, which has monetized its connections through its tremendous power as a corporate recruitment platform. With around 160 million members (mostly professionals in their 30s and older), LinkedIn has become the “virtual rolodex” for business people. When I meet someone professionally and I don’t get their business card, the most likely way for me to locate them is to find them on LinkedIn."
"Facebook is designed to let people share and communicate. Its design is based on the principle that people like to communicate with each other, so all its features and capabilities are built around “hyper sharing.”