What is the meaning of a Tic mark in a G+ account?
The tick indicates that Google verified the link/business and approved it as being a real objective with all the relevant information. You can do this as well following the guidelines posted on the following website: https://support.google.com/business/answer/4569085?p=link_page_to_website&rd=2
Provide as much details you have about your business and you'll get verified automatically.
