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.
This forum is here to bring people together who are interested in crypto currencies. There are sub forums in almost any language to make this forum as international as possible. While reddit has a broad spectrum, we focus here mainly on crypto currencies. If you are an active reddit user than it should be very easy to get used to bitcointalk.