Google Scholar Metrics provide an easy way for authors to quickly gauge the visibility and influence of recent articles in scholarly publications. Scholar Metrics summarize recent citations to many publications, to help authors as they consider where to publish their new research.
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ResearchGate is a social networking site for scientists and researchers to share papers, ask and answer questions, and find collaborators. Research Gate's mission is to accelerate scientific discovery by enabling scientists to share success, failures, and best practices across disciplines. (Source)