twtxt is a decentralised, minimalist microblogging service for hackers.

You want to get some thoughts out on the internet in a convenient and
slick way while also following the gibberish of others? Instead of
signing up at a closed and/or regulated microblogging platform, getting
your status updates out with twtxt is as easy as putting them in a
publicly accessible text file.  The URL pointing to this file is your
identity, your account.  twtxt then tracks these text files, like a
feedreader, and builds your unique timeline out of them, depending on
which files you track.  The format is simple, human readable, and
integrates well with UNIX command line utilities.

Usage:
View your timeline `M-x twtxt-timeline`
Post a status update `M-x twtxt-post`