It doesn't get you free speech but what it does give is power to the people to decide. Elections of those law makers. There is no avenue for the people in the current model.
I would be very wary of giving even more power to those who already have plenty of power. Also, there's no constitutional right to an audience. Everyone that gets kicked off of Twitter can continue to say anything they like, but they don't get to access the built-in audience that Twitter provides.