I know many people called me a freetard for my stance on free software. However, at least with free software, you know if there is or is not a backdoor (well, you can at least find out…or pay someone who can find out). You can look at the code, you can compile your own, in short….you can know. With non-free software, you have no idea. If I were still using Skype, I’d ditch it right now.
Picture from re-ality