I Personally never have and never will promote content locking. Its bullshit. there are other ways to have the same effect that are more "friendly" to the user.Compared to asking a donation, offering a free download seems to be much better. Just place ads on your site so you can monetize it. Also, offer your free downloads behind some content lockers. A visitor must first LIKE the page or TWEET it before they can see the download links. That way you can also increase your traffic.
I Personally never have and never will promote content locking. Its bullshit. there are other ways to have the same effect that are more "friendly" to the user.
Popunder is better than it