Social Media Sites: Which is the most Popular?

   When we talk about social media sites and the popularity within them, every individual site is used for the specific purpose or their intended user. We see artists mainly using myspace to popularize themselves, Facebook to connect with people,  and twitter to update everyone on yourself. But what site is the most popular and used the most out of the giant social media blogs? If you're wondering, I pulled up one of the more recent graphs that depicts the popularity within the social media giants. Here it is: