Some time ago – I can’t find it now, it may be gone – some enterprising person designed a website that would auto-mail a letter for you via snailmail to your Member of Parliament. You would write the letter as if it were an email, choose your MP, and it would do the rest. It survived off a surprisingly small amount of donations. The theory (which is mostly correct) is that politicians pay disproportionate attention to physical letters and ignore emails.
Now: when someone is smart enough to automate the process so that it provides a pre-written letter for one’s issue of choice (which you can edit, if you like) and auto-detects your MP (or representative in Congress, or whatever), then Facebook activism will actually just become activism. Because imagine if those 100 million Kony video views translated into 1/10th the number of letters. Washington would be flooded with paper. If nothing else, it would force politicians to stop paying disproportionate attention to physical letters, which are the domain of old conservatives.
(Now imagine it if it was an issue of real and lasting importance, rather than a story about an admittedly bad person which has been driven wildly out of proportion for what is likely profit motive.)