Yes there is. Linkcollider can help you in getting visitors to your blogs, YouTube subscribers, Facebook likes, Twitter followers among others all for free. All you need is create an account with linkcollider and you'll be guided on how you can go about all that. You'll be shown on how to collect tokesn and these tokens are the one's you'll be paying the people who work for you as have mentioned above.
Its you to allocate the number of tokens you will pay per every visitor who visits your blog or site. Collecting tokens is very cheap hence that shouldn't stress you. I have worked with linkcollider and I can prove that its really working. The good thing with linkcollider is that, its the real people who do the task and not the bots like in other sites.