Elsevier has become the newest customer of Impactstory's Unpaywall Data Feed, which provides a weekly feed of changes in Unpaywall, our open database of 20 million open access articles.

Fixing the problems with seeing, finding, and using software mentioned in the literature.

oaDOI is an alternative DOI resolver that gets free fulltext where available, instead of just an article landing page.

Impactstory will be buying a new data stream: Twitter, G+, and Facebook data from Altmetric.com. Altmetric have spent years working on the thorny problem of connecting tweets with articles.