Previously, Google Plus users were able to block people on Google+, which basically meant that those people would be removed from a user's circles and would lose the ability to comment on a user's content or view contents shared with that user's circles.
Google Plus users are not notified that they have been blocked, but it is possible that they find out about it because of the restrictions that go along with it.
The new ignore option is a lighter form of limiting what you see from a user on Google Plus. Google+ users won't see posts of ignored users in their incoming stream, won't get notifications about their activities and won't see them on their circle page.
Ignoring basically hides the ignored user on Google Plus, while blocking removes the user and blocks interaction. Google has uploaded a video about the new ignore option and the existing block option.
Update: The methods to ignore users have changed. What you can do now is mute users or pages on the site. To do so open the profile or page that you want to mute on the site, click on the drop down arrow below the profile photo and select mute from the list of options.
The methods described below won't work anymore.
Google Plus users can ignore other users from three different locations. The ignore option becomes available under notifications next to each user's name there.
Users can also be ignored directly from the incoming stream or from the circles page.
Google has built-in an option to remove the ignore again. This is done under More Actions on the Circles page.
The ignore option is not yet available for my account, which indicates that Google is rolling out the new feature gradually.
Blocking people on Google Plus makes sense, as you may need that option to remove spammers and annoying users completely. Ignoring on the other hand feels like a strange addition. What's the difference between ignoring a user and not adding the user to your circles? Is it the notifications part that gets blocked out when a user posts a comment or mentions you? There is actually a third option available for users, the mute post option.
This is again different from ignore and block, as it only mutes a specified post on Google Plus.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.