I have the S4 mini and have managed to turn off vibrations with all other apps through using their own settings (go into app, menu, settings...) and have done this for messages, facebook etc, but there doesn't seem to be an option for this in twitter? I want no vibrating except for calls (which I have activated separately in the settings/sound area). This is really frustrating me, does anyone know how to turn off vibrations for twitter?! Thank you in advance!