Academia is a research sharing platform for academics. Next to the opportunity to share your research, Academica also applies tracking software to gage the impact of the research and the academics they follow. Over 56 million academics have created a profile on Academia.edu, represented by over 19 million papers.
Where the upload and storage of your papers is free, funding is being required via donors. The analytics of your research output are limited to the last 30 days, the rest is not freely available. To get a full overview the Academia premium features are needed. This restriction and other limitations are for a discussion on the open access nature of the site.