Knowflow

Social logins are fail. Why you did buttons as a circle? What is G+? Really? I recommend you to fix these usability problems because your tools deserves this.

Прекрасный проект, вы большие молодцы. Жду приложение под Мак

This product has so much potential but it hasn't been updated in two years. A lot of lag, lots of Russian language, and some strange UI quirks. A little development effort would go a long way to making this usable.

If you took time to get used to it's quirkness this is actually one of the most powerful knowledge management system. Unfortunately everything about this platform looks shady, since it is funded by Russian government. In conclusion, this app is a perfect place to put and organize very unstructured knowledge. But if you value your privacy it's better to not disclose any private info there.