As stated in chapter 6 of Developing Personal Learning Networks for Open and Social Learning, currently the problem is no longer having trouble finding and free knowledge networks but rather learning how to choose a reliable one. Using your Personal Learning Network as an educational learning tool can be extremely beneficial, but you have to learn how to use the right tools. Firstly, we have to understand that we shouldn’t base our learning on a topic pt but rather on our ability to expand our knowledge learning about this topic from others. Students also need to learn how to use tools from their personal learning environments. 

Personally, one social media platform I believe can be good from an educational point of view is Youtube. It is free of access to the public and contains a comment section that can be used to share knowledge. Besides that, videos receive feedback, from the like button. Although the platform could make some readjustments to improve the platform, just as creating a specific explore page for education just like google scholar.