best digital e-commerce sites ?

I’m using sellfy.com I like it because there are a few interesting options for promoting your stuff for example “share gating” on facebook and twitter.
for example: if a buyer decides to share on FB he gets a discount.
It’s a good way to generate advertisement for your e-shop.

But I dont know any other.

What sites are you using to sell your digital products ??

Search the forum. There are numerous threads about this. No need to start a new one.

I know many developers that have used http://fastspring.com/. I’m not sure about their integration with social media however.