If you have a website, with a "Facebook Like" box on it, it probably shows something like this:
- 400 People Like this
Did you know that number is not just the total number of people who clicked "Like" on your page? Did you know you can artificially inflate that number?
Send a message to yourself with the URL in the body, such that it becomes an "attachment". Watch as the like-counter increases by 1 or even 2. Lather. Rinse. Repeat.
Sending messages to other people probably does the same thing. But sending to yourself is sufficient.