There's also Green Card PERM Salary data available on sites like http://visadoor.com http://visadoor.com. H1B's typically have less years of experience compare

There's also Green Card PERM Salary data available on sites like http://visadoor.com http://visadoor.com. H1B's typically have less years of experience compared to Green Card applications, even through both their titles might say Senior Software Engineer for example. If you are researching salaries, I would definitely look into PERM Salaries as well. Glassdoor groups all the salaries reported for a title over the years in one bucket. Hence, I find the PERM and Labor data very helpful because you can see how salaries have changed over years. Eg. http://visadoor.com/companies/facebook-inc http://visadoor.com/companies/facebook-inc http://visadoor.com/h1b/index?company=Facebook%2C+Inc.&year=2016&submit=Search http://visadoor.com/h1b/index?company=Facebook%2C+Inc.&year=... http://visadoor.com/greencards/index?company=Facebook%2C+Inc.&year=2016&submit=Search http://visadoor.com/greencards/index?company=Facebook%2C+Inc...