So a bunch of people have come together on Twitter to let Sony know that they wouldn't appreciate Sony putting DRM on the PS4. If you feel like helping, here are a couple links to help you out in terms of who to tweet at and what to tag.
To be clear, Sony is already aware that people would not appreciate the DRM, but for them to really be convinced that DRM would be the wrong move, they need to see that the public is openly talking about it. Getting the 2 tags that were created for the protest on the top trend list is what the movement is aiming for, then.