A Public Profile
This is your own little piece of digital real estate where you tell the world about yourself. Profiles contain basic information like a photo (usually of yourself), short bio, location, website, and sometimes questions that can describe your personality (e.g. your favorite actor or book).
Social networks dedicated to a special theme like music or movies might ask questions related to that theme. In this way, dating websites can be seen as social networking websites because they network you with other people who are looking for the same things you are.