Ayni is a platform on which you practice languages with native speakers.
SpecsUpdate
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Pros
Pro Focuses on practice
It is focused on practice with penpals and it provides content about how to get the most out of language exchange.
Pro Engaging conversations
Writing a real person is much more engaging than repeating words from a program. You are more likely to continue with Ayni than other programs because you can actually have a conversation instead of simply learning words and phrases.
Pro Free
Pro Great to find an active penpal
This is a small community (+2000 active users) but active, as it does not look like a social network but more like a collaborative platform for matching.
Cons
Con Not a lot of users to interact with
It is very hard to find a Japanese or Korean pen-pal on Ayni. However even some of the more popular languages don't have many users to talk with.
Con Website has a lot of grammar mistakes
The website itself (English version) has quite a few grammar errors throughout. The lack of attention put into the site, especially language errors on a language site, are concerning.
Con Not recommended for beginners
There is no content if you start learning a language from scratch.