They tend to be different when they announce it, but what they did just copying almost all of bitcointalk useful threads.
I hope you are not trying to build that kind of forum.
That's kind of inevitable isn't it?
Many of them miss a trick and don't have well organised casual sections unrelated to crypto. Sometimes you want to talk about something else with the pals you've made. An expanded non crypto bit for various subjects might encourage more discourse and bring in some users. One 'off topic' forum is too general and they tend to be aimless and shapeless.