Yoast tests Google’s meta description character increase
As an avid Yoast SEO user, I always make sure to fill out the meta description for pages and posts. The goal is to always get the indicator bar within the green. Sure, Google can and will generate meta descriptions for your pages from the content on them. However, if you have a page which can’t really be tailored for SEO, You might see that page indexed with garbled code. Pages for content such as galleries, portfolios, and reviews tend to have snippets of information here and there. Google has no way of telling what the most important piece of content is.
