You can also add some twist to it. One can add members widget and FB likes box. Add fake members (I know everyone involved in CPA, PPD and PPI have at least 30-100 G accounts, use them to add fake members). Add fake likes on FB page (500 or over should be good as we really won't be using the page). You should get 500 fake likes pretty easily.
Point of all this is it hits psychologically. Remember, users visiting your website will usually be in age group of 16-20 years. When they see a few members, likes and comments, they don't think much and click on the download link. At least in my case it helped me improve my conversion rate. Even you could give it a try. Use your other G accounts to add comments. Make sure they look natural and not over-hyped comments.
I know most of you are already using this method. Hopefully, this twist will help newbies.