About 3 and a 1/2 years ago, I joined an online community called Hanlingo. I wasn't aware of any other online communities to exchange language, and this community focused on Korean/English language exchanges. It was a perfect match for me, because I wanted to practice and learn more Korean language. The community was young at the time, and I was one of the earlier people to register.
I watched as Hanlingo grew better and better with the addition of new features and a more advanced searching technique so that I could more easily find better exchange partners. Then discussion boards developed, which was a quick place to get answers. Then there was the addition of the point system, which encouraged accurate responses to language questions.
Recently, the site has been more focused on local meetups in Korea and the point system for answering language questions appears to be gone. However, this community still has some interesting features for foreign language exchanges, but sometimes they are a little difficult to find.
If you are able to determine how to find everything on the site, then this site will still be a 5-star exchange site.