Good Method? Using Private Message to Promote FB Page to UIDs

Has any one tried using this FB Page feature that allows users to "Share in a private message"?

I tried it manually a few times and it looks great in the inbox.

I was thinking how to use it to promote fan page by the means of targetted UIDs.
I know there must be some limits to how much private message can be sent by a single user but the feature is there for users to use right?

Also, I was thinking about using spintext, random intervals and random post (links, photos and videos) from…

Good Method? Using Private Message to Promote FB Page to UIDs