A blog (a portmanteau of the term web log) is a personal journal published on the World Wide Web consisting of discrete entries ("posts") typically displayed in reverse chronological order so the most recent post appears first.
Twitter is an online social networking service and microblogging service that enables its users to send and read text-based posts of up to 140 characters, known as "tweets". It was created in March 2006 by Jack Dorsey and launched that July.
Mlkshk is an image- and video-sharing site that's fun, accessible and useful. Andre Torrez and his wife built it, bootstrapping it without investment and without having to worry about what outsiders think such a site needs to do.