It should be just

apt-get purge twitter

Try at your own risk.

To reinstall

apt-get install twitter


Do at your own risk though and don't mess around with this stuff unless you were are willing to re-flash your device. I had a dependency issue when installing locate (I had a thread on this somewhere) it just started removing everything from the command line. I lost the shop and quite a few other things. I was able to reinstall the shop from the command line, but still had to re-flash though as it had removed some essential things.