I'm hoping this topic might be FAQ-worthy, as I've seen many examples lately of thread titles that don't address the content of their thread very well. Perhaps with a little guidance, members can do a better job of providing helpful titles when they start a thread?
A good thread title is one that tells the reader what they will find in the thread when they open it. Here are some examples.
"Who makes the best hamburgers in Anytown?"
"Property tax bills are getting higher"
"Stray puppies in my neighborhood"
Now imagine if those same 3 topics were titled with these thread titles. Would you know what they were discussing without opening the thread?
"Where can I find..."
"Just got my mail today and Yeeeow!"
"So cute, but so very sad"
If a topic is worth starting a new thread, it's worth taking a few extra seconds to summarize that thread with a descriptive title. Other people's time is valuable. Maybe they're not interested in your topic, so do them a favor beforehand and let them know what it's about! It's a polite thing you can do for your fellow members of City-Data and it takes only a few extra seconds.