Top four people with the highest number of followers on twitter

Twitter was founded in the year 2006 and now having 500,000,000 number of Twitter users, per one March estimate and also 20,000,000: Number of fake Twitter accounts, per the New York Times, in April 2013. Twitter is having more than 400,000,000: Number of tweets sent per day and more than 170 billion number of tweets in total, 54,365 number of verified accounts as of Sept. 12.
Now I'm bringing you the top for people with the highest number of followers on twiter presently. See list below after cut...

1. Justin Bieber 

Justin Bieber is topping the list with 44,483,000 followers.

2. Katy Perry

Katy Perry is the second with 42, 693, 600 followers

3. Lady Gaga

Lady comes third with 40,106,600

4. Barack Obama

And the US president is the fourth on the list with 36,556,600