Yes, I do post in these hiring threads as well as freelancer threads on my personal account every month. I have been working with two companies, and have invoiced them for nearly $200k in the past ~2 years for development and consulting work. One of them is a startup, the other a software shop for startups. All web-dev & api work. In both cases, they reached out to me. I have had no luck reaching out to companies in those threads.