Just FYI, I bought 25 proxies. First 5 accounts made it okay. One account required phone verifications, but these accounts are basic accounts, no cookies, etc. So far so good. And for anyone wondering, I think I saw this earlier, but these are most likely ipv6. IPv6 is really really cheap. You can get them by the millions because the ranges are so big. So each ip costs a fraction of a penny. I work for a very large international web hosting company, we issue IPV6 basically for free. But, the good news, it works. So thats good news for us all. But this means they can probably lower the price a bit, since they are really just paying for the servers now.
This also might explain why it doesn't work with twitter, I don't think twitter has full ipv6 functionality.