If you're trying content locking with any social media site, I highly recommend that the content you're offering should be enticing to the targetted audience, enough so that they're ready to fill out random surveys to get the content.
You should also put catchy titles to your post from where you're deriving traffic,
and at the content locker page, the content behind the ad overlay must be attractive and should seem geniune!


Hope this helps!

There is a guide right here on this forum. Check it out here:

http://www.warriorforum.com/social-m...marketing.html

Edit: oops its gone now but it showed content locking with ogads.com

Make sure the content is extremely relevant to your audience and preferably have it give something away for free like an ebook or free report. This will give people more incentive to unlock it. You can also maybe say that they have to complete the survey in order to verify they are human first or something like that.