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In my opinion writing diary is for girls, and there is always the danger of being seen by others that shouldn't be good at all specially when you write some private things. but when you call it "documenting events" or "journal", i could manage to take it.
however if you want to use an online diary service (journal as they called it) try
Penzu . if you are like me doubting why to start diary, see
this.Have Fun!
Source :
http://www.makeuseof.com