The problem is that not only their methods "aren't perfect", but completely ineffective.
If you are posting on a public social network, your data will be available to the public, one way or another. The whole protest becomes a "performance art" kind of thing: it might be useful for creating awareness, but in most cases the people who will be seeing it are the ones who are aware of it in the first place.
> people who will be seeing it are the ones who are aware of it in the first place
People are not aware of everything all the time, we forget quickly.