Click on chart then click again to see large image
Note the importance of Skype in relation to its once wannabe owner, Facebook.
Email remains a dominant force with 830 million users signed up to the top three providers. The chart also provides some context to the recent LinkedIn IPO.
77% of the world’s population are now using mobile devices and almost 22% of these mobile devices are smartphones.
China’s version of Facebook (QZone) has experienced enormous growth and now has 480 million users.
40% of users tweet using their mobile.
Click on chart then click again to see large image
Click on chart then click again to see large image
Source: JESS3 – a creative interactive agency that specializes in visual storytelling
Thedigitalconsultant's Blog 
Great chart. I guess this is what MS saw when they bought Skype. Just looking at the numbers is a wrong way of evaluation. Engagement and therefore Monetization are two keys that these charts don’t describe and so may be somewhat misleading. Also Skype’s current revenue model has to change if they want to become profitable.