UPDATE 2

Whereas the categories can be increased. The idea is to replace the categories above with SMS, MMS, eMail, links, audio messages  (AVI) and so on. So I need an app or some sort of software to be able to do that. And that's definitely a trouble spot and a possible show stopper. The gyst of it is that a site on the internet can serve as a sort of digital "post office" of sorts similar to services like Dropbox but more personalized. For example, let's say I want to communicate something to someoone who is not present. You can what? Email. Text, MMS, call, DM, etc.