If Facebook et al are going to replace the dying traditional print and broadcast media, maybe they need to be subject to the equal-time rule as well? Pushing "Don't forget to vote!" reminders only to Facebook users who are likely to vote in favor of facebook-friendly policies and candidates is one interesting anecdote I've seen. I take it with a grain of salt but it's nevertheless illustrative of the power that can be wielded with such a platform/network. It definitely can be done, so why wouldn't it?