ResearchGate serves much the same purpose as Academia. They are competitors more or less. I don't put any papers on either site but links to papers on my own site. Sites like these survive by monetising their content and the eyeballs that they attract.

They have a more structured approach to associating yourself to an organisation, if you so choose. But like other social media sites, you follow people and will be notified of follows and publications of people you follow. It also sends you stats about citations but you can get those more easily from Google scholar.

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