Originally posted by Rico Shameless v2

There's no credibility involved, as this ranking is not meant to be an official chart. If you'd read the article, which you must have some interest in to post, you'd see that & the purpose of the site as a whole. But to differentiate:

Social 50
Artists' popularity is determined by a formula of blending their weekly additions of friends/fans/followings along with artist page views and weekly song plays.

Amplicate
Amplicate.com is an opinion-collection and advocacy service with a database of over 80 million opinions from people around the world. Real, unsolicited and uncensored opinions are constantly collected on more than two hundred thousand topics ranging from search engines to software, to music, movies, banking, shoes and cities around the world.