Jordan Nabigon is the CEO of the content curation site Shared.
He was a big Facebook customer, spending nearly $46 million in ads on the site.
That is, until the platform booted him without warning or explanation.
According to Business Insider, Facebook says Shared violated the site's terms and conditions.
However, it wouldn't explain what the violations were.
Nabigon says several of Shared's pages have been unpublished since October 26, taking 21 million of the company's followers with them.
