Only Twitter said no, and pointed him to a blog post stating as
   "...company policy a prohibition against the use, by outside
   developers, of “Twitter data for surveillance purposes. Period.”

   Facebook: No answer.
   Microsoft: “We’re not going to talk about hypotheticals at this point,”
   and a link to a company blog post that states that “we’re committed to
   promoting not just diversity among all the men and women who work here,
   but … inclusive culture” and that “it will remain important for those
   in government and the tech sector to continue to work together to
   strike a balance that protects privacy and public safety in what
   remains a dangerous time.”
   Google: No answer.
   Apple: No answer.
   IBM: No answer.
   Booz Allen Hamilton: Declined to comment.
   SRA International: No answer.
   CGI: No answer.

   In full:
   [1]https://theintercept.com/2016/12/02/of-8-tech-companies-only-twitter
   -says-it-would-refuse-to-help-build-muslim-registry-for-trump/

References

   1. https://theintercept.com/2016/12/02/of-8-tech-companies-only-twitter-says-it-would-refuse-to-help-build-muslim-registry-for-trump/