Why would I use google+ hashtags when I post for my blog?

[Carley]

On my google+ account it says "Add hashtags when you share to tie your posts to relevant themes and trending topics, increasing their visibility." What does this mean, how can I do it, and why would I?

[Lucas]

It means that google+ would categorize your post with other posts you tagged with the same hashtags.
Also if someone were to hashtag their post with cars, if someone were to search for cars on google+ it might come up. As for doing this all you have to do is put a hashtag (#) before the word you want to hashtag.

Hope this helps