Delete some icons in the Social Share pop-up

Clicking on the Social Share button in EasySocial brings up a lot of icons, and my users don't have many of those social networks.

Is it possible to only keep FB, Twitter, Google, and Tumblr, while deleting/hiding the other icons? Either on the back-end or via CSS?

Also, how do I remove the Recipients box right below the icons?

Thanks.