I'd like to share here another great website to practice languages with people around the world: Speaky.
I've met a lot of nice people there who have helped me to improve my language skills a lot in the last months. I hope it can be useful for you too ;)
Verbling is another site, but it's group-based and tends to be predominantly English and Spanish. You'll sometimes see Arabic, Russian and Japanese, but these aren't as common.