A Social networking Site was originally designed to act like a get together place for the millions using internet around the globe.
With the benefits of creating profiles as per the wishes of the user, the Online Social Networks now even facilitates their users by letting them upload their photographs.
Following the aspects of the basic structure- a Social Networking Site is always implemented with a module wherein the users from both the end do confirm necessarily in order to be included as a part of a link or hence formed network.
This has been seen to be replaced recently as some networking sites have been seen to develop schematics wherein there exists a tab of favorites eradicating any feature that would need approval from the invitational side.
Though this feature can be used or disabled, the most common factor is that every Social Networking Site moves in with an option for the user to choose as to who to show their profiles, which can be made private/public/ or specifically filtered in some cases.