Researcher ID is a global, multi-disciplinary scholarly research community. Each researcher listed is assigned a unique identifier, to aid in solving the common problem of author misidentification. Search the registry to find citations, collaborators, and more.
Unfortunately, the sign up process is clunky, bouncing you between sites. So clunky in fact, that after 15 minutes and eight failed attempts, I gave up. So if anyone ever does manage to sign into researcherid.com, please blog about it.
In the meantime, I'll carry on not using Connotea and CiteUlike, because scientists don't share. And I won't bother to allow Thomson Reuters to reduce me to a number so I fit more neatly in their marketing spam database.