"A serendipity engine on the Twitter sidebar".A "second brain" provides easy access to all the resources you've ever Liked or ideas you've ever Thought. @ExGenesis' Threadhelper brings a subset of this (just Tweets) right into the twitter UX - it looks brilliant.Check out the video: https://www.youtube.com/watch?…

No fremium model - minimum price $19/m - but it looks worth it: "Meshfire turns Twitter into a dashboard of tasks... The tasks can be to reply to different tweets, or to block someone or follow someone. Every twitter account is a mission inside Meshfire, and every mission has a goal. You define the mission ... a virtual assistant inside Meshfire…