No it is not. Here’s why:

Hackernews is more accurately called a forum, and forums have been around way longer than social media.

The key defining aspect of a social media platform, is that the members are minting social currency and building a network. The social net worth of users comes in the form of followers and influence. The content you post on your profile is an asset, it farms for you while you sleep.

On social media, your media is socializing for you long after you’ve posted it. It exists forever, welcoming people to like, to comment, to subscribe, etc. On a forum, your post is read for a few days then never again, as people move on to newer posts. On social media, algorithms keep your content circulating to fresh eyes.

On hackernews, there are no followers or following, there is no network being built. Your comments are not assets, they are ephemeral ideas that quickly dissolve and are never read beyond the first few days they exist. People’s reputation depends on their good name, and most people will not even remember the vast amount of people they talk to in the comments. Often people don’t even look at usernames. There is a karma system, but it is of limited value in terms of influence, it is used more as a sorting mechanism for good posts within comment sections.

On true social media networks, your profile stats are like a credit score. You can post stuff and if you’re a big shot you instantly collect the attention of a vast number of people and easily pick up new momentum.

On HN, you have to fight for attention, and it doesn’t matter if you are a long time user or a brand new noob, you will fight just as hard. There is no long term reward for writing good comments, only momentary glory. This means there is little incentive to chase trends. If you miss a trend, no one will notice or care, and you gain nothing by following the trend. A key aspect of being socially active is that you have some awareness of societal trends and are able to keep up with them, it shows you are conforming to the larger conversation in society and are relatable. This is what social media is about.

So the takeaway is, just because you are socializing on a site, does not mean it is social media.

But, you can still be manipulated even on a forum. Look at the insane cargo cult around Rust that formed here on hackernews a few years back. You can even be manipulated into becoming enraged, but at least because there is little to no monetary gain from writing anonymous comments on the internet, it is the purest form of trolling.