Yeah, my posts are probably insignificant, but so is everything I say in real life, as well as my existence in general. However, I think that for every person who rushes into a thread and posts their own opinion without reading any of the others, there are people like me who read entire threads, sometimes without writing a word themselves. There have also been times when a post has made me laugh, but I never quoted it because I think it would be inane to quote someone only to say "hahaha", and I'm paranoid it will be misinterpreted as sarcasm. Point is, you never know when your post has made someone smile.
I also think that just writing out your opinions or experiences is kind of therapeutic. It doesn't really matter that no one cares. Counsellors and psychologists never give a shit about anything you say either, and you actually have to pay them; they just sit there and pretend to listen to you talk shit. Writing things out just helps you organise your thoughts, and pretending that someone out there might want to read your post is enough excuse to make one. It's certainly much easier to justify and less excruciatingly shameful than writing a diary. Overall, I don't think the time I spend on the internet is a bigger waste than whatever else I would find to distract myself in it's place.
And since this post turned out uncharacteristically optimistic, I think people are sick and barely tolerable. I hope my post makes you cry. Although you probably didn't even read it.