We try to avoid threads that we think are likely to collect spam, i.e., add more clutter than value to the forums. Deciding which threads fall into that category is a judgment call for the moderators. Threads with a vague purpose are more likely to be judged that way. It's generally not promising when a thread begins with an "I'm bored" comment, since it's a sign that almost anything posted would be "better than nothing."
In general, if a thread encourages people to
post but members are unlikely to have any interest in
reading posts by others, we consider it a useless thread. That can apply to threads asking random questions (What's your Mac's uptime? What's the weather like where you are? What's your favorite color?) but sometimes those threads generate interesting discussions. Again, it's a judgment call.
Over the years, we've experimented with allowing random question threads, "post a picture" threads, "tell a joke" threads, etc., with mixed results. Some of them are OK, but it's easy for them to become "attractive nuisances" where people try to build up post counts with little benefit to others. Even though nobody is forced to read threads they are not interested in, many members make use of the
New Posts feature and the
Forum Spy, so those threads can still be an annoyance.
Not every thread has to be a source of great intellectual discussion, but we try to keep the average quality up when we can. Also please note that most actions by the moderators are the result of reports or complaints by members. With thousands of posts per day, we see only a fraction on our own, so we rely on members to help keep the forums in good working order. It's hard to spot all problems and be consistent, but consistency is our one of our goals.
We understand that nobody wants to have to wade through outright spam, but there always will be differences of opinion about threads of borderline usefulness. Suggestions/discussions about our policies continue to be welcome.