“We don't even need the CIA anymore. I can find anything I need to know about someone by checking their Facebook."

  Facebook contains most of peoples information, Facebook users have been tracked down by police in other occasions, for violating user rights and publicizing and promoting violence.

“If only people's lives were as exicitng as their FB pictures project them to be, they would not have the time or need to update their FB profiles!”

  Facebook users don't only use their accounts to entertain them. Facebook is used for several purposes, such as business, promoting, and keeping in touch with long distance families.

“Apple, Ford, even Google create things of value and are worth their valuations. Anybody who buys FB shares as an investment (as opposed to speculation) is a fool”

  In terms of users and popularity , Facebook would make a great investment if and when it remains as it is now. There are far more other generations to come that are still not Facebook users which are being grown into the network. 

“I have never been tempted by Facebook, even less now, though I suspect many who have joined will regret having their posts follow them around for years to come.”

  If your ashamed of something , you should never regret posting it. Looking at past post makes you sometimes realize how you have grown or changed as a person.

“I personally do not invest in any company that does not create REAL value. Whether it is manufacturing or services. Facebook provides no value. As another commenter here called it, it is 'legitimized voyuerism' [sic]*[1].”

  The value that Facebook provides for some people isn't always that price that you can visually see. For some users, they cant live without Facebook because it is the only way for them to interact with people, so for them the value is beyond someones reach because of their dedicated time to the network .