I am trying to extract Facebook ids from a list of emails using the url:
let url = "https://graph.facebook.com/search?q=" 
          + email.Replace("@","%40") 
          + "&type=user&access_token=" 
          + facebook.Token
After around 600 id extracts I get the error "The remote server returned an error: (400) Bad Request.". Is the facebook API/Search rate limited? If so where is the doc?