The Plaudit browser extension, which allows you to view and add endorsements of scholarly articles, added support for a number of additional publishers and preprint servers recently, the newest addition being MIT's Pubpub.

Install it yourself to be able to see whether academics you know have endorsed the research you encounter:

Sign in to participate in the conversation
Scholar Social

Scholar Social is a microblogging platform for researchers, grad students, librarians, archivists, undergrads, academically inclined high schoolers, educators of all levels, journal editors, research assistants, professors, administrators—anyone involved in academia who is willing to engage with others respectfully.