Minggl is a social network manager that adds a "relationship layer" to the social web. It puts you in control by offering a unified (multi-site): 1) friend list 2) in box (email) 3) news stream 4) place to update your status 5) way to tag an categorize friends 6) a multi-site email tool and much more If you have an opinion about a specific company or person, you can even use Minggl to drop a "note" onto their website, that ONLY your friends can see
