Nancy Wilson published a couple of blog posts about the practice of journaling (Read Part 1 here and Part 2 here). In general, she doesn't think it a healthy practice, as it tends toward self-indulgence. She includes blogging as a form of journaling, and I think the way many people use social networking sites would also qualify.
The comments are interesting- especially those who believe that chronicling their trials, temptation, and even their sins help them process and deal with them. Some think that the Psalms and Proverbs are a form of journal-keeping, and that the private writings of people such as David Brainerd and Amy Carmichael are of benefit to us now.
What do you think about the practice of journal keeping in general, and blogging about one's private struggles in particular?
