What are dpuf (extension) files?

Question

I have seen this extension in some urls and I would like to know what they are used for. It seems odd, but I couldn't find any information about them. I think they are specific for some plug-in.

Answer 1

It seems to be connected to 'Share This'-buttons on the websites.

I found this page which gives a quite comprehensive explanation:

This tag is mainly developed for tracking the URL sharing on various Social Networks, so every time anyone copies your blog content there he gets the URL ending with #sthash and extension with .dpuf or .dpbs