The open web is still growing. The perception that it's dying is just because proprietary services like Facebook and Twitter have dominated public discourse on the web, but it's still alive and well.
It's not growing as fast as it was, sure, but for example the number of active blogs has grown by 12% in the last 7 years and 4.4 million blog posts are published every day, more than ever before.
This page claims "70 million posts from wordpress users", which comes out to 2.3 million per day. And there are many more other blogging platforms out there.
If you are interested in non-Facebook/Twitter I recommend getting an RSS client first. Then as you read Hacker News, add the feeds of the interesting authors to your reader -- many front-page articles have RSS links somewhere. You'll have nice, non-FB reading list in no time.
It's not growing as fast as it was, sure, but for example the number of active blogs has grown by 12% in the last 7 years and 4.4 million blog posts are published every day, more than ever before.