Today is International Worker's Day. On Twitter, the day is celebrated by sharing your salary, job, title and city with the hashtag #talkpay. Since race and gender are still (sadly) salary issues, many folks include that data as well.
If you're a developer, chances are high that you can find someone like you sharing their salary. This is a great opportunity to learn what your peers are making, and also to share your own salary.
If you would prefer to share anonymously, you can do so using The #talkpay bot. You can find the results at @talkpay_anon.
Keep in mind: location has a huge impact on the value of a salary. You can't compare a salary from San Francisco to a salary in Detroit without doing some research and calculations. You can read what I've written on this subject here.
If you want to learn more about the value of your skills, consider checking out Comparably, Salar.ly, and glass door,.