Yeah, this guide is pretty ridiculous. So many of these "problems" came from bad legislation and a culture that enabled it. "Hi boss, we're getting millions of DMCA takedown requests." The solution? Fix the brokenness of the DMCA. "Hey boss, we're getting a lot of notifications about misleading info!" Ok, tell the users to not believe everything they read on the Internet. "Hey boss, we're getting lots of reports abou…
1. Provide a form for copyright owners to use to request a takedown of material they claim is infringing. When the form is submitted verify that all the required fields have been filled in.
2. Take down the content claimed by the form submitted, and notify the user who posted the content. The provider does not need to try to figure out if the material claimed really infringes the claimant's copyright.
3. Provide a form for the user to submit a counterclaim. If the user does not submit a counterclaim, there is nothing more to do.
4. If the user submits a counterclaim, restore the taken down content, and notify the party that requested the takedown. The provider does not have to try to evaluate the merits of the counterclaim, such as whether or not the use was fair use.
If the claimant still wants the material taken down they have to take it up with the user, such as by suing them. The provider, having followed the DMCA procedure given above, is protected by the DMCA safe harbor.
It only gets hard when a site wants to use some system of their own, like YouTube does, instead of DMCA. Due to the nature of user created content on YouTube and how YouTube is monetized it is better for them if something that infringes gets licensed and stays up, so they have deals with major content distributors to encourage that.
For a site like Twitter, where the user content is small text posts instead of longer videos that can have ads within them, I don't think they need more than the DMCA procedure.