Make sure you are logged in, Go to Facebook.com homepage.
On the top far right, you will see an arrow pointing down, Click on it.
a menu just popped up, Click on settings.
On the left menu click followers.
You will now see “Who can follow me”.
You will see other options now and may change all to “Everybody”.
Everyone can like your posts now, Non friends and people that don’t follow you, Which increases the chances of you content going viral.