Vi.sualize.us. Additious. Piccsy. 5 genuinely useful Twitter tools. There’s eleventy-billion Twitter apps, tools and services all vying for your attention. Some of them are pretty, some tell you some type of score (as if Twitter was some kind of competition) and some, well, some just seem to be side-projects for bored programmers… :-p But the following five Twitter tools are those that I find genuinely useful. They add value to my little social networking world. 1. Mr Tweet.