Do you have any more suggestions besides ideas for traders?
The idea will originally emanate from you, Zukerburg for example, had the fb idea, and shared it with his friends to see how they could make it work. if you've nurtured your ideas, the btt community can only come in then to give you their own opinion on it, but these days if you need someone else to think of an idea that could bring money to the table, they do not come cheap, you'll have to pay for it, if not include them as co owners in the deal.
What do you guys think of a bitcointalk like website for bitcoin community with friends, minor marketplace etc.,
If you want to connect with close friends to discuss about bitcoin, create a group on social media (facebook, whatsapp etc) and add friends, you can increase the number of participants with time, but creating a website like btt or reddit, you'll get zero traffic, unless you do things (paying them to post) that once you stop, the traffic evaporates.