I wonder how secure these sites are. I've seen one site that seemed legit but after a few weeks, the person was locked out of their account. We can never be too careful. I guess the real test is after several weeks or several months.
How many bits/Bitcoin do you get from the mining? Is it automatic, when you log in? Per day, per minute? What are the details exactly?
RE: BITCOIN Mining for "FREE". (Yes free, check this out you have nothing to lose.)