I take the diary as "a place" where people could always work out the existing problems, understand their feelings or moods, reflect the experience, to come to any solution. To ensure that the diary was the most useful, it must be the "place" where you can be absolutely sincere. And so I suggest you write it only for themselves, not trying to show it to your spouse, a therapist or someone else. If you keep a diary, assuming that someone else will ever read your writing, you unwittingly start sift something that prevents you better look in the eyes of others, or write well, to make the other feel guilty, or simply want to show their loved ones, as you have, etc.
However, if after you make any record, you feel that a good idea it was to show (or, better, read) that the record (because it is your good sense) a certain person, then do it. I protest and warns you against writing-for-order-to-someone-read. And do not leave your diary in mind, if you live with someone who has a curiosity to your life. In doing so, you provoke other is that he began to poke his nose into your affairs, and himself to secretly reveal to him.
The word "blog" means daily, but not turn keeping a diary in the next "must." I would prefer that you saw the diary as a tool, accessible at any time. You can write when you need or want, sometimes daily, sometimes once a week, sometimes forcing himself to do it every hour!
