Concerning English-Spanish there're good forums about specific subjects in wordreference.
Here a way to keep interesting matters in the first positions, is searching deep in the forum and writing a comment to make it pop up at the top again. I think it works like this anyway.
I hope this helped.
The discussion forum was used to be an interesting place for discussion last year. It is flooded by the stream of requests all of a sudden.
Having said that, what kind of topics are you interested in?
It is highly appreciated if you would throw interesting topics in English or any target languages while digging deeper into the abyss of requests to find interesting topics as David has mentioned before.