ResearchGATE is “a free social networking site aimed at scientific researchers from all disciplines …” (excerpt from the current Wikipedia entry). I’ve recently become a member, but literature searches can be done by non-members. For example, a literature search for the key words “open access” AND “self-archiving” yielded 11 results. One for “open access self-archiving” yielded only 4 results. A search for “open access publishing” yielded 65 results.
Today, I initiated a thread on Open Access within the Science Communication Group. (One needs to become a member to visit or contribute to this thread). The comment that I added is about a link to Peter Suber’s “Open Access Overview“, via: http://tinyurl.com/lb3r3