I've had that issue with multiple android phones and I consider myself a power user. None of the phones were infected with any malicious apps of any sort. The issue isn't your phone but a combination of two things:
1) These articles you're reading are from sites that are serving ads with malicious script. The sites generally don't know this as they sell adspace via vendors such as google adsense. The ads are generally pushing some sort of malicious script to your phone that will hijack certain functions (redirects, constant buzzing, etc).
2) This is a core vulnerability ESPECIALLY with facebook's garbage built in browser. Most browsers piggyback off of general google APIs in the first place so google is partially to blame for even allowing this.
There isn't really a hard solution right now. Google will be solving this with future updates to android. Chrome itself will have a type of adblocker built in soon and will not allow autoplay videos and redirects by default. As far as your phone being secure the play store has had and will continue to receive some security updates on the server side.
Anyways, I wouldn't worry about it. I'm sure it's an option on the s7 as well but my phone is encrypted and most should be by default, it should be in security settings. Other than that your best bet is just to try to manually open the sites up in the browser because I've noticed the facebook built in browser is much more susceptible to redirects. As I said, it will be an upcoming feature in chrome as well.