Instagram changed the way it rate limits like, comment and relationship endpoints in its API recently...you can sign API POST requests with an HMAC hash of your client secret and app IP address. I am doing this successfully. I know this because I get a 403 error message if I don't include the a properly hashed X-Insta-Forwarded-For header; get a 200 success message if it is included).
Still, I'm being rate-limited to 30 "like" calls per hour (the limit for unsigned requests); 100 is the limit for signed requests. Anyone know why this might be?
Updated docs are here: http://instagram.com/developer/restrict-api-requests/
and