This just sheds some stronger light on what I've thought about protected posts all the time.

If you give something to somebody, there is always a chance that it will no longer be private. People pass on secrets... even more so if they think the other person can be trusted.

Informing people about Frienditto solves the problem of people trusting Frienditto. The bigger problem is... how do you know which friends on your list aren't already copying around the protected posts? :-)