I'm a social creature. I have a long history of being involved in various online communities and being interested in what individuals link to, whether they posted it to the front page or linked it in comments.
The degree of my interest is partly based on personal relevance and partly based on "reputation" of the poster, for lack of a better term.
If I know someone has a strong background in something and/or posts a lot on the topic, I may click into something they posted in part because they posted it. This can be true in spite of personal friction between us or me having a negative view of them or their behavior.
It isn't a case of "I like them personally or see them as a friend, so I check their links." It is very much "I believe them to be knowledgeable about X topic and I am interested in X topic."
If I don't have any idea who they are but they wrote an interesting comment and linked something within that comment, I may take a peek for that reason.
Conversely, if I have reason to believe they are pushing an agenda in a completely disrespectful fashion and/or "don't confuse me with the facts, my mind is made up" kind of way, I may skip their links because it is probably fruit of the poison seed. On HN, I occasionally run across, for example, angry "feminist" handles who are just here to spew manhating venom. The content they want promoted here is often vile and far worse than merely a waste of my time. I may feel like I need a shower after being exposed. No thank you.
I sometimes know of someone who is a weird intersection between I respect their knowledge and I cringe at their blatant toxic behavior. That gets tricky at times. But, most of the time, checking information posted by someone who has a strong background works well as a filter for finding good information without wasting a whole lot of my time.
I currently spend time on HN, twitter and reddit. You can kind of curate twitter content because what is in your feed is largely based on who you follow. I unfollow people who fill my timeline with things I find objectionable and I keep an eye out for interesting accounts.
On reddit, I avoid the front page and gravitate towards small out of the way subreddits pertinent to my interests. My recent experience of reddit has been overall positive. The first time I tried it, it lived down to its nasty reputation. This time has been completely different and it has a lot to do with how I am interacting with the site.
I'm strongly interested in people. That goes a long way towards exposing me to diverse content.