No, it's impossible to remove them (there is facebook, twitter, and 2-3 preinstalled games). The only solution is to hide them at the bottom of the application list.

Hello,
whatsapp and facebook are not installed by default on the nokia 3310. So no worries.
I'm not sure if it's a good idea to use the phone to write messages on a keyboard.
For your info the battery life is >15 days if the wifi is disabled. Another world