The pile charts illustrate the proportion of popular social media channel with five categories (Facebook, Twitter, LinkedIn, google plus and Pinterest ).
Overall, Facebook and twitter were widely used over a half of total, whereas Pinterest was least used in the given periods.
In 2011, the figure for Facebook accounted for nearly a third of total (59%). Although it dropped 10% and 9% in 2012 and 2013 respectively, it was being highest proportion in the these years. On the other hand, twitter obtained 21% in 2011, after which it increased a mere 2% each for the last two years. Similarly, the modest 10% had been contributed by LinkedIn in 2011. Then it ascended to 12% and 15% in 2012 and 2013.
Regarding the two social media (google and Pinterest), which were lowest applied in 2011 only at 5% for each. In 2012, google ascended double and went up to 4% in last year. Pinterest increased only 2% for each year with a tiny minority 6% and 8% individually. 
The pile charts illustrate the proportion of popular social media channel with five categories (Facebook, Twitter, LinkedIn, google plus and Pinterest 
 )
. 
Overall
, Facebook and twitter were  
widely
  used
 over a half of total, whereas Pinterest was least  
used
 in the  
given
 periods.
In 2011, the figure for Facebook accounted for  
nearly
 a third of total (59%). Although it dropped 10% and 9% in 2012 and 2013  
respectively
, it was being  
highest
 proportion in the these years.  
On the other hand
, twitter obtained 21% in 2011, after which it increased a mere 2% each for the last two years.  
Similarly
, the modest 10% had  
been contributed
 by LinkedIn in 2011. Then it ascended to 12% and 15% in 2012 and 2013.
Regarding the two social media (google and Pinterest), which were  
lowest
 applied in 2011  
only
 at 5% for each. In 2012, google ascended double and went up to 4% in last  
year
. Pinterest increased  
only
 2% for each  
year
 with a tiny minority 6% and 8%  
individually
.