The article that the tweet linked to is titled, Getting Started With Audience Targeting Using Google Analytics Data, and it’s by Pam Castricone, writing for InfoTrust.
Let’s say that you’ve discovered a certain segment of your market. Let’s say that there’s something that distinguishes them--maybe their age, location, whether they’re a previous customer--something that you can measure.
Well, by targeting that demographic with a message that’s customized to them, you can probably increase your conversions--or at least see how that market responds to your targeting.
Getting Started With Audience Targeting Using Google Analytics Data tells you what you need to know about targeting an audience: it gives an intro, then a definition, common audience strategies, ways to build audiences, and even activation on GMP (Google Marketing Platform).
So, if you want to get started with audience targeting using Google Analytics, Getting Started with Audience Targeting Using Google Analytics Data is a good place to start.
Source: Google Analytics Twitter channel