People still give a damn about other people but blogs are out of favour and instead have been replaced with Hacker News and Reddit and other such social communi

People still give a damn about other people but blogs are out of favour and instead have been replaced with Hacker News and Reddit and other such social communities. Blogs are centred on just one person while communities are centred around an interests which partly explains the rise of Reddit, etc.. and the fall of Blogger. Also, in terms of web browsing experience, it's much better to read different Hacker News or Reddit posts then to visit a different blog sites and then have to orient oneself to the navigation and UI elements each time; the voting mechanism also makes finding good stuff easier than just by reading a blog. What is the definition of a Blog? Is it just a place to host articles? If so, then even Github can be used. Is a Blog just centred on a person's ideas? Then Twitter is a blog or has replaced blogs. TLDR: Blogging is still alive, but just has taken different forms. Now as for the Why, why not? People like to express, discover and exchange ideas.