1. When someone says they are going to kill themselves and then they don’t post again for days.
2. When they say it again a few weeks later and you don’t hear from them again.
3. When you lose the draft of a valid (I mean, not frivolous) blog post. Actually, there are two of them that I can’t find.
4. When you come to care about a number of people in the blogging world but then you can’t keep up with them all.
5. That’s about it.