I don’t entirely agree but I recognize that it really depends on each person’s use. You can run a blog that auto-publishes to Twitter, Facebook, etc. so that you, personally, don’t have to be logged in or visit. But if you want to use the services and and be invisible to them you’re going to need either separate browsers or use private browsing modes.
I didn’t say Linux was less secure, I said OpenBSD focuses on security. I use FreeBSD for my NAS because it natively supports ZFS, which I like. Though I may move the NAS to Debian because ZFS has some performance issues when the drives get full or RAM gets tight, and I want some consistency across the servers I use.
BSD distros just tend to keep things a little more reigned in and their development process puts security at the forefront. You will find much fewer packages available for them and might even find yourself compiling source code for a particular program you want because it’s not included or available in any other fashion.