How to organize repository of common research papers for lab members? The Problem
I am a graduate student in a research lab with several other students, and as such we're all pursuing research and dissertation topics that are at least generally related in nature. We sometimes find papers relevant to others' topics during lit reviews, and right now we're just pushing them into a shared Google Drive folder. 

That works fine, but the problem is that we don't really have a way to notify the relevant students when a paper is put into a specific folder (it's a fair-size lab with several students, and we're already drowning in noise emails ... we're not thrilled about adding more and basically CCing everyone the article touches). 

The Question
We're looking for a service that essentially pushes a once-daily changelog of the filenames of added papers and the directories they've been committed to, sending them to the email addresses of all students in the lab (so that everyone can look over the daily list and skim it for anything interesting).

Does anyone know if such a thing exists? Or do you perhaps have an idea to help us out of our management woes?

Thanks!
The simplest solution to this problem that I can think of is just to use Mendeley (or service with similar functionality) that allows people to form groups (public or private), based on their research interests. Then, all activity, such as adding relevant papers, etc., automatically appears on group members' news "wall", plus they can set up e-mail notifications and such. For more details, see corresponding Mendeley's pages: https://www.mendeley.com/features/collaborate and https://www.mendeley.com/groups.

Obviously, solutions for more complicated research workflows will require more specialized software tools: open source, commercial off-the-shelf (COTS) or custom built.