In a gesture she maintains was made "for inspiration, not revenge," the Harry Potter author uploaded a number of rejection letters garnered by The Cuckoo's Calling, a murder-mystery novel published under her pseudonym, Robert Galbraith. My earlier post (16 July 2013) offered some thoughts on that subject!
Many of Rowling's seven million-plus Twitter followers undoubtedly had a good laugh. If a few editors and publishers have egg on their faces, so much the better.
The complete BBC article can be accessed through this hyperlink: http://www.bbc.com/news/entertainment-arts-35899243?ocid=global_bbccom_email_25032016_top+news+stories.