As Google+ has grown, so have the number of spam comments on the social network, and now Google is dealing with the problem by adding a new spam blocking feature. You can now flag inappropriate comments, and once you do you'll be presented with a series of options, letting you either un-flag the comment, remove it entirely, or both remove it and block the offending party. Doing the latter will prevent the user from commenting on your posts in the future, as well remove them from your circles and content stream. If the new feature proves successful, we can probably expect to see something similar on Facebook in the near future.
Google+ adds enhanced spam blocking feature
New spam blocking option make ignoring annoying Google+ commenters much easier.