ScreenClip(22)The idea of scribbling electronic notes in the margins of e-books is not new—David Rothman mentioned it back in 2006, though I’m sure it’s actually older than that. But last month the New York Times covered the fact that e-books meant scribbling in the margins would be much harder. ReadWriteWeb reports on an API created by ReadSocial, a new project from the founders of BookGlutton, to try to make e-reading more social. Through a proof of concept Firefox and Chrome extension called Readum that uses Google Books, users can highlight, annotate, and share on Facebook passages from a Google...