Facebook:
More than 500 million users
50% of them visit every day. Friends
The average is 130 per user.
Users spend over 700 billion minutes per month on facebook.
Not to mention the second-most visited site across the Internet.
twitter: Twitter
has 75 million registered users.
has more than 25 million users who visit the site at least once a day.
With at least 500 million tweets per day.
is the eleventh most visited Internet site. LinkedIn
He has over 60 million registered professionals. Including
500 companies.
long the average user uses in his LinkedIn account is 5 hours per month.
Skype 290 million registered users.
has an average of 23 thousand users online every day.
has exceeded 124 million online users per month in the second quarter of 2010, of which only 8.1% pay for the service.
has transmitted about 95 billion minutes of voice and video in the first half of 2010.
Sources:
http://www.vincos.it/world-map-of-social-networks/
http://www.idontfixyourpc.com/2010/08/le-graphique -daujourdhui-met-en-exergue_22.html Http://www.computerworld.com/s/article/9148878/Twitter_now_has_75M_users_most_asleep_at_the_mouse
http://vator.tv/news/2011-01-26-skype-delays-ipo-until-second-half-of-2011 http://www.facebook.com/press/info.php?statistics
http://www.alexa.com/
http://about.skype.com/