Yes, start a conversation. Nobody can see it unless you add multiple parties to it (don't know if you have that option). Post on a member profile page is what others can read publicly.
Showcase, articles are some additional reading material if you wish to read. Also, has some other details on member free drawings/raffles I think. If they put new stuff our there, I'm assuming that why it shows up. It's good reading if you get a chance.