A year or two ago, I added the first newspaper editor I worked for, way back in the 80s. I didn't remember much about the guy, except he was smart, nice, and gave me a break. (I went from freelance writer to tech guy)
Once we were friends on FB? Holy cow. This man was a committed communist, seemed to hate the culture he was living in, and every day was posting the most provocative stuff. (I am fine with whatever opinions you want to hold. It's just odd to have the editor of the local business magazine declare his support for communism.)
I commented a time or two -- I got sucked in. Then I realized that this was only a sad, lonely plea for attention. He could use Facebook to tweak people, and as long as they responded, angry or not, he got engagement.
He's one of those I muted.
Contrast this to another friend, whom I had also lost touch with. Turns out he is a local businessperson and conservative.
Heck, I hardly ever hear from him. Maybe a post or two every month. It's usually bland or jocular in nature.
I guess if you're engaged in some traditional local social organization, you might lean to the right. You might also have a lot of opportunities to chat outside of the internet. If, however, you're engaged in more progressive, national social organizations, you might lean to the left. You might also view the internet as a means to stay motivated and help motivate others.
That question fascinates me, as I've heard it before from my left-friends. As far as I know, most of my right-friends don't have a site they go to, or commentators they follow. They just do their own thing, and politics isn't as central to their identity or lives. They value doing things, where my left-leaning friends seem to value interesting conversation & debate.
In Australia, we had a political commentator called Andrew Bolt, who I guess is like Australia's Fox News. But the only people I've ever heard watching his show were politically-left friends, who seemed to enjoy being offended & outraged at what was said, and debating it with their friends. They seemed convinced that's what right-leaning people watch, but my right-leaning friends can't be bothered with it, or most TV / newspaper discourse.