answer:texlive doesn’t have much to do with the fonts you use when you type messages at Facebook. If you ever decide to try your hands on LaTeX, you should install that, but if you don’t know what LaTeX is, don’t bother :) How to use the fonts differs per application. You can set the font used on the desktop with the Appearance prefences window. In Firefox you set it in Edit->Preferences, then under Content you can set the font. I believe the default font should support most typing systems, but if it doesn’t, you can try to use the font “Ubuntu” which should really support a lot of systems.