Then again, it's not like my posting on social media is really the equivalent to doing something. Generally, when I try to comment or correct, it tends to explode into a series of more ignorant comments (some of them made by me) that only get me more angry than the original post did. In the end, the exercise only seems to further entrench the person I was trying to enlighten as well as lead to me getting unfriended by people whom I (perhaps sadly) still care about. Getting blocked by people certainly doesn't let me guide them in the future.
I generally try to stay silent. When I come across a post that makes my blood boil, I often quickly research the subject to confirm that my position has backing, write a scathing (and often insulting) reply ... and then delete it. Sometimes I then write a more measured response, but more often I leave it at nothing. Unfortunately, on rare occasions I "accidently" hit the "post" button; although, I have been better about deleting my comments after the fact. If it's something particularly upsetting, I might write about it as one of my own posts.
There's too much hatred out on the Interwebs as is. I really shouldn't add to it.