I realize I’m relatively new to the library scene as a second career librarian, so some of what I’m asking may have been covered somewhere already. I’m fine with being corrected in the comments (since there is no better way to learn than to question), but I’m still going to ask.
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Science 2.0 Gains Another Search Engine: Q-Sensei From Lalisio
"While the 2 million-plus article content nowhere near reaches the size and scope of behemoths such as Elsevier’s Scirus or Google Scholar, the Q-Sensei search engine (http://literature.lalisio.com/oai.html) has a metadata orientation that offers some interesting search capabilities."
and "At present, the Lalisio social network of scientists seems to be the most active side of the operation (www.lalisio.com)."