The influence of facebook in our society

Today, they are more and more people using social networks on the internet as a medium of communication, but one of the most influential is that we know as Facebook.
Who has not heard about facebook? I chose this topic because it is so popular in our society, especially young people and children although now more adults who dare to use it too. Facebook was created by Mark Zuckerberg in February 2004, was originally a site for students of Harvard University, but now is open to anyone with an email account. Now has over 800 million users worldwide, it has expanded very quickly at all places where there is a computer, laptop, cell phone or whatever that has internet.
It has become an important tool for social relationships with various functions such as games, events, applications, groups, photos and videos in which we have the option to comment, some people use it to interact with others, meet new people or reconnect with old friends, from the old school or something like that, but also to know what they say, think and do the other people, as well.. get to know different points of view to issues that are contingents, but ...is this really good?
Well, I think that is good and is very entertaining, I like to use it a lot to communicate with others and share ideas but really their use has big disadvantages, because there are people who spend a high percentage of their day at the computer,connected to this website, apart from perhaps more important things like work or homeworks, etc., becoming a vice. actually is a little impossible to avoid feel the need to first open the Facebook page when you're on the internet, before anything else ..I'm sure many of you, who have facebook, the same thing happens (including me) but something else is really bad in my opinion is that separates us from the actual physical contact, of which we need to share with others. Apparently now the most communication is via virtual and physical personal contact is the setting aside ...

We also need to be careful because it is getting used to commit crimes around the world, because as it comes at the beginning of the web "anyone can join free" unfortunately there have been cases of extortion, forgery, pornography and violations of privacy, reason  which we have to be very careful with that is published because anyone can see who are our friends, family or know our preferences of the things we like or not, as the workplace, where we study, so it is advisable to choose the maximum level of privacy, because you never know if someone may be collecting all this information for malicious purposes, you never know whose hands can reach it.
I really think many of you have a Facebook account or have heard of it ... what do you think? How do you think they have influenced in our society and why to not say ..in our culture? Can we live without Facebook or without the social networks of this style in a few years?  How do you think human relationships would be if this did not exist? Would that be the same? How to evolve our society with networks of this style? ...
Finally here is a video from a argentinian publicity spot that makes a parody of Facebook or something like that apparently gives understand how facebook has become part of our way of relating.