I want to change my profile picture to Ruth Bader Ginsburg, do I have to worry about copyright?

- I wouldn’t worry about it. No one’s going to sue you over using an image as a profile pic on a message board.

- Honestly, no. I have no interest in doing so.

No, you don’t have to worry about copyright. It falls clearly under fair use. If you’re really worried, use an official government photo. They are automatically placed in the public domain.

No, my avatar is always a Caravan album cover.
Nobody will sue you.

As noted above, no need to worry about it. But FYI most pictures on Wikipedia are public domain, meaning nobody owns the rights, they are free to use.

For example, note the licensing language here: ” This file is a work of a United States federal court judge or magistrate judge, taken or made as part of that person’s official duties. As a work of the United States Federal Government, the file is in the public domain in the United States”

Feel free to use this one. It is from the link above and is in the public domain.