The most notable factor to be mentioned and consolidate would be to grow the network or a community size. Therefore an individual tends to add as many friends as possible.
Though this kind of an act is used to grow the community, it also adds another benefit as the individual who helps add up the list of members: actually moves above in the network hierarchy.
The act of linking more friends involves the process of sending friendship invitations, requesting friends to join in the community.
Intimidation is a common aspect of human nature and thus this nature forces some profile creators acquire names and identities of animals or popular individuals, to keep a mystery and attract others.
No just that profiles acquire identity; of fictional characters, thus enhancing the outlook of the respective profile.
Moreover, the issues of privacy, which has been crossed in the past, often force members to hide their personal details which; has come up a major issue with regards to the matrimonial and dating sites.