Traditionally, defining a target audience involves determining their age, sex, geographic locations, and especially their needs (aka pain points). Check out usability.gov’s description of personas and how to do task analysis & scenarios for more details, or better yet, read Vanessa Fox’s upcoming book about personas related to search and conversion.
Use social networks to expand your reach. Social networking is hugely important, and ensuring that you have a solid presence will have a large impact on your views. Post compelling content and you’ll soon build a loyal following. Follow and share with other users, who may reciprocate and follow you. There are a variety of ways that you can use social networks to extend your online presence, depending on the needs of your site.
Hey Ted, thanks for the great questions! The peak times refer to your particular time zone, if you are targeting an audience that resides in the same zone as you. You can also use tools to find out when most of your audience is online. For example, Facebook has this built into their Page Insights. For Twitter, you can use https://followerwonk.com/. Many social posting tools also offer this functionality.