About 20 years ago when I was in university, I was looking for anything to do part time and posting links on random blogs in replies was one of the jobs that could get you some money. The job came with excel sheets containing where to post those links and what to post. I was more interested in automating this process. There was a captcha involved in this process to somewhere. We didn't see it as spamming. It was 'ad posting' job or something.

Don't remember a lot. Just reminded me of my time doing this. I don't remember actually posting much links myself because it was too boring and lots of manual work for not much benefit.