Event Data is a new service from Crossref. It collects links from the web to items of Crossref and DataCite Registered Content. It describes new forms of scholarship beyond traditional publishing, and forms an underlying data-set that can be used for altmetrics, amongst other things. It records this data as a stream of links between pairs of URLs (e.g. Tweets, blog posts, Wikipedia pages linking to scholarly articles). Sometimes those URLs are DOIs, sometimes they are publishers' article landing pages. In doing this, it bridges the world of persistent identifiers and plain old URLs. I'll describe the service, pitfalls, the trends we tend to see, and why you'd want to use it.
https://www.crossref.org/blog/bridging-identifiers-at-pidapalooza/