An online social network is much like your real social network. It is your friends
and your family, work colleagues and acquaintances.
A social network is a way of staying in touch and making new connections. In the real
world you can’t see the connections between people. In the online world you can
immediately see who knows who, and who your friends are friends with.
Once you add your friends and family to your social network it’s very easy to share
photos and videos, send messages, post comments, arrange events, chat, make
recommendations and play games.