Google+ is a social media platform that allows users to connect with others through circles and share content like text, images and videos. It has over 540 million monthly active users. Key aspects of Google+ include circles to organize connections, a profile page to create an identity, and the ability to post and share content with select circles or publicly. The guide outlines how to set up a profile, circles, cover photo and begin posting on Google+ streams and communities. Consistent posting and use of hashtags and relevant links can help optimize content discovery on Google+.