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A user profile is a collection of settings and information associated with a user. It contains critical information that is used to identify an individual, such as their name, age, portrait photograph and individual characteristics such as knowledge or expertise. 
Internet identity ( IID ), also online identity, online personality or internet persona, is a social identity that an Internet user establishes in online communities and websites. It may also be an actively constructed presentation of oneself.
Facebook Connect,  also called Log in with Facebook, like OpenID, is a set of authentication APIs from Facebook that developers can use to help their users connect and share with such users' Facebook friends (on and off Facebook) and increase engagement for their website or application.
Secular, atheist, agnostic, humanist, or users who comment or blog expressing views critical of particular religions, sects or religion in general, as well as religious people who express the opposing views critical of atheism or agnosticism may feel they have a legitimate need to use an alias.
This meant putting the name of a user, a brand, an event or a group  in a post in such a way that it linked to the wall of the Facebook page being tagged, and made the post appear in news feeds for that page, as well as those of selected friends.  This was first done using the "@" symbol followed by the person's name.
How To Report An Account Hack On Facebook. The “Password and Security” page also includes a list titled “Where You’re Logged in.”. If there’s a log-in that you don’t recognize ...
As users engage with these electronic services, they create highly interactive platforms in which individuals, communities, and organizations can share, co-create, discuss, participate, and modify user-generated or self-curated content posted online.