“The Initiative for Open Citations (I4OC) was launched in April 2017 with the purpose of promoting the release of structured, separable, and open citation data. Thanks to the incredible support of a large (and still growing) number of publishers and stakeholders, in one year more than 500 million citations have been released to the public, and are currently used by third parties for building new services to serve the scholarly community. In the first part of my talk, I will recall the main milestones reached by the Initiative, while, in the second part, I will focus on outcomes of one of its funders, i.e. OpenCitations, showing the way Semantic Publishing technologies have been used for describing and releasing a huge collection of open citation data.”