RT @lisalibrarian
Today Clarivate added the Preprint Citation Index to the Web of Science.

(It is a limited number of preprint servers though and I wonder -- are we living in the time of an emerging prestige hierarchy of preprint servers?)

https://www.prnewswire.com/news-releases/clarivate-adds-preprint-citation-index-to-the-web-of-science-301741758.html