A consideration first:
Having e-mail or newsletter subscribers is better than having people following on Google, Facebook, Twitter, etc.
Because if that person subscribes to your articles, it means real interest.
People can also subscribe to your feeds, which is also good.
I use Feedburner for feeds, which you can see on the left column of my blog, and Feedblitz for e-mail subscribing, visible on the right column (there's a counter and a subscribing option).
My newsletters are spam free and can be listened.
I also use OdioGo for those who wish to subscribe to podcasts.
http://theartinquirer.blogspot.com