sharea sale has to be in the top 5 most popular cause it has a lot of different niches and hundreds of programs. Your not gonna find stuff from certain niches though you may have to google for some in house affiliate programs. This is a good review of them http://www.dollarsblog.com/shareasalecom-review/
ShareASale has the best customer service in the Affiliate Network industry, it really is second to none. Being small has its advantages. Solid Reputation – First class reputation in the industry with a fiercely loyal following. Easy Commission Payments – Payments go out monthly via check, PayPal or direct deposit.