Google+ got integrated strongly with blogger, their by allowing its user profiles and user pages to get linked in blogger posts.
If you want to add someone in blogger posts, you need to type a plus "+" symbol followed by name of user or name of page.
For example, if you want to search Vic Gundotra, it will display as
Based on searching characters, it will display names of person you are following or your friends, followed by profiles and pages from Google+.
When you add the profiles it will appear as link in the post with a plus "+" symbol as a prefix in link.
While you are sharing this post on Google+, the profiles and pages inserted in post appears in the sharebox. Once it appears in sharebox, you cannot remove and share on Google+. It is made mandatory to share with the inserted profile or page.
Once you hover over the link appeared in posts, it will display a card which contains more information about the link; if you are following, it will display as Following otherwise it will be having Add to circles button embedded in it.
By clicking on the link, it will take you directly to its concerned Google+ profile or page.