Steps from Google:

  1. Head to the Gmail web page. Open your browser of choice. …
  2. Log into your account. …
  3. Go to the Settings page. …
  4. Make sure you are in the General tab under “Settings.” …
  5. Scroll down until you see “My Picture.” …
  6. Change your visibility. …
  7. Save your changes.

Facebook: once per month use a desktop or laptop only (not a smartphone), update your privacy settings, change your password regularly.

  1. Facebook – (links and bullet points are from Facebook and Google)
  2.  Within your account settings, you’ll find a tool that helps you change the audience of posts you’ve shared with Public or Friends of Friends to Friends Only. To use this tool: Click at the top right of any Facebook page and choose Settings. Select Privacy from the left menu.
  3. Basic Privacy Settings & Tools | Facebook Help Center | Facebook

https://www.facebook.com/help/325807937506242/