Gmail: Please see this important update about Gmail on IFTTT.
Facebook Pages: Web users may encounter an error when trying to connect Facebook Pages. Try connecting from the IFTTT mobile app instead. We are working with Facebook on a solution.
Instagram: Non-English users may not be able to initially connect. Try changing your language settings to English and it should work. We hope to have a permanent fix soon.
Check out status.ifttt.com for other updates.