This website seems to be similar to reddit except with an older UI. It's obviously more focused on the topic of bitcoin but I can easily find a group on reddit to talk about bitcoin.
Reddit is another platform on which many projects have their own topics and communities.
The forum (bitcointalk.org) is a forum for Bitcoin discussions initially and for others (discussions about altcoins and other things are derivatives of time). Owners or core admins of the forum have full control on its database. It is different than on Reddit and you can not ask the core admin (theymos) to shut down the forum and totally depends on Reddit database, rules, policies for Bitcoin discussions.
Theymos is the core admin of this forum and if you've yet known about his account on Reddit, here you go