How to block someone who invited you to join their Google+ circle

A circle in Google+ (G+ or Google Plus) is a group of people with certain criteria. For example you can create a circle called Family in which you can invite your family members (or whoever you think your family). You can of course create other circles and determine who will be there in that circle.

Other people somewhere you don't know may also create a circle. What happen if you receive a notification in your Google+ saying that you got an invitation to connect to one of their circles. Do you know who is inviting you or not? You don't want that invitation?

Here is how to block a circle invitation:

1. Go to the Google+ profile of the person inviting you.
2. On the side of the profile click Block [person's name].
3. Confirm that you want to block that person.