Social media marketing (SMM) is a form of Internet marketing that utilizes social networking websites as a marketing tool. The goal of SMM is to produce content that users will share with their social network to help a company increase brand exposure and broaden customer reach.
URL tracking is the process of adding unique identifiers to your destination URLs. If you aren't tagging your urls for tracking in either analytics or another third tier system you are losing out on a lot of helpful information.
Google analytics is a free analysis tool by google. all major information related to site performance is measured by this tool like no of visitor, bounce rate,exit rate, visitor location, time spend on site etc.
Google Authorship is a way to link content you create with a Google+ profile. Google provides a means to get started and more information here, and our The Definitive Guide To Google Authorship Markup guide will help you through the process.