What are dpuf files (extension)?

Question

I saw this extension in some URLs and I would like to know what they are used for. It seems strange, but I could not find any information about them. I think they are specific to some plugins.

Answer 1

It seems to be connected to the “Share this” buttons on websites.

I found this page that gives a fairly complete explanation:

This tag is mainly designed to track the sharing of URLs on various social networks, so every time someone copies your blog content, they get a URL ending with #sthash and extension using .dpuf or .dpbs