Twitter is not the way to go for me. I m busy working the whole day, and as a sailor i have no time to continuously update the time i wake up, brush my teeth, take a dump or going somewhere else etc. I dont find it useful either. But when it comes to facebook, its the only life that i have. No socializing onboard, thats to our company we have internet onboard and now we talk to friends and family. I guess i spend around 4 to 5 hours on the internet, can't say exactly how much on facebook, but quite a lot.