Even with the social media of today, there remains a need for education through long form posts. Look, Twitter and Instagram and even Facebook are great for seeing a flow of ideas and headlines but they aren't good with substantative content, this is why blogs continue to reign as the only way to have deep materials.
Admittedly, both Facebook an dLInked In have built a sort of onsite blog for articles. This sort of works. But each article is isolated and there's not a canon of work with tabs and themes the way that one can get on a blog.
Teachers often find the indepth info that makes a huge difference to them thru these blogs.
And blogs help with people finding people. Here's info on education for Jennifer eaton.