Speaky is a chatting app that with two interesting features. It lets you discover interesting people by browsing profiles that contain short descriptions, and also engage in chatting where you can edit both yours and your partner's messages. Editing another's message will create a corrected copy in which you can see both the original and the altered text. This is very helpful if you are looking to improve your writing in specific languages but don't have someone to practice with.
Profiles also show which languages people are interested in and also the level of mastery they consider to have achieved in each one. I honestly like the the fact that Speaky is a very simple app. This as well as having a clean presentation, makes for a very friendly environment without any useless distractions. The developers had a very good idea and have implemented it well and in a very concise manner.
You might also make some new friends. Who knows. Go practice!