Permanence, meaning everything a user does, says or posts on Facebook
is recorded and never erased. Facebook is like a digital journal of
your life. Memories and photos will greet you every time you log in.
Identity is also a big part of Facebook. Mark Zuckerberg realized ten
years ago that by tying individuals to their school email addresses,
you could bring offline relationships online. Facebook is now like a
passport to the Internet, giving people credibility whenever they sign
on to a partnering website or comment on a friend's post.