I've heard everywhere that you need 10 private proxies in order to post and public proxies for scraping. Well, I did not have the funds nor did I want to spend money more money when I can use the free option. All I did was find websites with daily proxy lists and use those. I would wake up early and get the list while it was fresh. I would then test the proxies (timeout = 10 seconds because if it takes any longer, the proxies aren't worth your time), and then clean the duplicates and failed. Don't save these proxies just yet. Scan them again and you will get some more failed ones but you should be left with enough. My posts don't take that long anyway, and I'm fine with leaving my VPS running 2 instances of Scrapebox. Once the list is done, I extract the "Posted" list. Then I extract all the "Failed" posts to the desktop and name the file "failed.txt" I then replace the Blogs List with failed.txt and re-post. This way I get a couple hundred more posts leaving me with a smile on my face. Hope this experience helped answer some of your questions. And yes, I do know that private proxies are a lot better than public proxies, but some of us would rather choose to go the free-route.