I usually write best topics which is very useful for all the users to communicate with others and make a good relationship them. check here for best group names to represent your group uniquely.
I have recently written blogs of a more personal nature about events that happened to me. While it has not generated online interaction, I have heard from a surprising number f people who commented on it in person.
Two blogs I have written have generated interest among my target population. They are 10 Reasons Women Need to do Strength Training and HELLO Weightloss Tips (HELLO–Healthy, Every-day, Long-lasting, Lifestyle Options). My main target population is women from the ages of about 30-65 years, and these two topics are a constant stream of dialogue for them! 🙂