Re:Mailit: A Tiny Drop-In REST API to Send Emails
by pmlnr on Tuesday August 01, 2017 @06:27AM
(#14899269)
Gmail is IMAP and SMTP, and Google Talk is (or was) XMPP, all on port 80 in the same browser window. Others are more metaphorical. Twitter is IRC on port 80, although one primarily listens to users instead of channels — but listening to channels is still possible, if one uses a client that can follow hashtags, and the syntax is even the same. Dropbox is FTP on port 80. Reddit is Usenet on port 80.
https://medium.com/@maradydd/on-port-80-d8d6d3443d9a