ORCID is the only scholarly profile service that is partnered with publishers and indexes for automated updating.
ResearchGate and Academia.edu are scholarly social network sites. They are for-profit companies in the business of selling premium services, populated by researcher upload and crowd sourcing. They have no trusted automatic uploading features from publishers or indexes. They also do not have export features for sharing lists with other services.
Google Scholar profiles are very popular and are populated by researcher upload. Google Scholar has export features for sharing lists with other services, however it doesn't have trusted automatic uploading features from publishers or indexes.
LinkedIn is a popular professional networking site with publication and activity listing features. LinkedIn has export features for sharing lists with other services, however it doesn't have trusted automatic uploading features from publishers or indexes.