It's not open access but will certainly be a useful new feature for scientists, science bloggers and other journalists. Since Washington University has site licenses to most of the 49 Nature Publishing Group journals and to Scientific American, scholars at WU will be able to share links with colleagues. Go to the article on campus or while authenticated as a WU user, click on Share icon near the top, and copy the "Shareable Link" which is on the top of the Share menu. This can be posted on blogs, websites, facebook, emails, etc.
A New Way to Share Articles—and Help Advance Science (@Scientific American) included a short video intro to the sharing links feature.
In a Move Toward Open Access, ‘Nature’ Allows Widespread Article Sharing (Chronicle of Higher Education) Includes a comment that the impermanent nature of the shared fulltext might be bypassed using screenshots and Evernote.
Nature makes all articles free to viewNature makes all articles free to view: Publisher permits subscribers and media to share read-only versions of its papers (Nature News)
Nature's shareware moment
Is Nature’s “free to view” program a step back for open access?
Public access and protectionism