Wordreference language forums
For languages wordreference.com has various forums all language related and the moderating is visible and effective. No off topic posts are tolerated and the forums have a large volume of participants. There are usually thousands of people logged on at any given time. I browse and participate occasionally (under a different user name of course) as well. They have a forum called 'S?lo espa?ol' and they mean it. All grammar related questions and answers must be in Spanish. Therefore, those who are looking for a Spanish forum wordreference is good but for grammar and language related questions only.
They have a lot of knowledgeable Spanish speakers from all over and many from Spain IMO. It's interesting to read their comments about the responses from speakers from Latin America when some of the really interesting and more complicated grammar questions arise. To really appreciate some of the discussions and responses you have advanced level grammatical knowledge or get to that point eventually to really appreciate the discussions. IMO, some are too lengthy and detailed for the topic at hand and I usually don't read all of them once someone posts what I would have responded.
WordReference Forums
DR1 Mini Blogs
Another suggestion is the DR1 mini blogs. The topic of choice by 'you' the blogger does not have to be DR related as clarified by Robert when the blogs were introduced/ activated and why not have some of the blog comments/ discussions in Spanish. Whatever you write about write in Spanish and have some DR1 members read it and give their feedback in Spanish. Be creative with the topics. With languages it's easy to find a way to practice and make it enjoyable.
~Marianopolita.