I Just checked up on this and you are technically incorrect, but practically correct. You can delete with apt-get twitter, but it will remove other stuff that will wreck the system. interestingly when I deleted Skype, the shop and a few other things by accident once I was able to reinstall them and it worked perfectly, well until I rebooted I think a couple if days later. This was not unexpected though. Anyway my suggestion clearly should be ignored.