Hashdoc is a web site where you can find a lot of titles organized by tags or hashes. Users can share different types of documents and discover items to read.
It shows trending files, you can save items in a personal list to read them anytime, filter and digg in choosing more refined subcategories to find exactly what you need.
This service does not have so many users, is at the beginning, but you can find useful resources that may help in your profession.
Is focused on professional resources.