When not to blog:

Last Shabbat I listened to one of the leaders of a Chavurah minyan explaining to members how she was going to keep them abreast of schedules and events by Email. Afterwards I pointed out to her that if she made a blog, she could arrange that each entry was emailed to her list, but in addition, all of her information would be permanently available online. “In other words,” she said, “the members can go to my web site to see what’s going on.” I agreed.
“I don’t want that!” she said. “I want people to feel that if they want to know what’s going on, they have to come to services.” She could tell that I was a computer-oriented sort of person, so it was with difficulty that she realized she had convinced me she was right.