This is a "Share to Download" plugin, and works for Facebook, Google+ and Twitter.
Easily manage downloadable files and monitor downloads of your digital files from your WordPress site.
Download Monitor is a plugin for uploading and managing downloads, tracking downloads, and displaying links.
Adds a powerful download manager including file categories, downloads counter, widgets, sorted file lists and more to your WordPress blog.
Enables you how many times a files (in one of 5 mirrors server) had been downloaded.