One can also generate X-ray search requests with a help of SignalHire software. All you have to do is to set filters (location, company, job title, skills, keywords etc.) and choose web source (GitHub, Facebook, LinkedIn, Twitter). The system will generate X-ray search request for you in a couple of seconds.
https://workology.com/how-to-use-a-google-x-ray-search-to-find-hidden-candidates/

