ASN (Academic Social Networks) such as Academia.edu and ResearchGate are popular places to share ideas, research and collaborate with fellow researchers (Van Noorden, 2014).
ASN encourage users to upload copies of published research, but doing so may infringe on the copyright agreement you signed with the publisher. You can avoid this problem by providing a link to a copyright cleared copy of the article in CRO (CSU Research Output). Alternatively, you can check the Publisher's copyright policies using Sherpa/Romeo, a searchable site of publisher copyright policies & self-archiving details, i.e. some publishers allow self-archiving of copies of an article at different points of the publication cycle, or after an agreed period of time.
Jamali (2017) discovered that in 2015, more than 50% of the non-Open Access articles found in ResearchGate, did not comply with publishers' copyright and self-archiving policies.
For further reading on using ASN see the following articles:
Jamali, H. R. (2017). Copyright compliance and infringement in ResearchGate full-text journal articles. (Report). Scientometrics 112(1): 241-254.
Van Noorden, R. (2014). Scientists and the social network. (News: Feature). Nature 512(7513): 126-129.