Need your advice on wordpress plugin business strategy

Hi All,

I am planning to scale up a premium wordpress plugin into a highly profitable business. Which of the below market has high number of buyers and potential growth from your experience/knowledge ?

  • affiliate marketing related wordpress plugin
  • social media (fb, g+, tw) related wordpress plugin

the strategy is to, release a free version and promote the premium version + build a successful blog around this premium wordpress plugin site.

Thanks for your support.