In short, it means that it's more important than ever to post engaging content on all platforms.
Google will still promote and show posts you make via Google Local Posts, but your Business Profile will now include posts from your linked social media profiles as well. There's no guarantee that all posts from the other sites will be shown on your GBP listing, but this could potentially increase the reach of your posts from other sites.
In other words, the update simply makes your social media profiles and posts more discoverable on Google — making it even more important to post authentic content to your brand's local social pages often so consumers can discover and engage with your business. It's a great reminder that your social profiles are an important part of your digital presence — and with this expanded cross-channel reach, managing them is key to standing out (and making connections with more customers).
If you are a Yext customer, continue to use our Social product to post on Google, Apple, and Facebook, and we will keep you up to date when we add more social channels that you can leverage later this year.