Google announced having disapproved the support of the social profile markup. This means that Google will no longer look at the markup you have added to your pages specifically for these knowledge boards.
The announcement. Google stated that it would "automatically discover which profiles to include" and no longer rely on social profile markup.
The social profile markup for knowledge panels is now obsolete. We now automatically discover which profiles to include. Those who have requested knowledge groups may also suggest profiles not included. Learn more here: https://t.co/OgXAs8zsxy
– Google Webmasters (@googlewmc) June 25, 2019
What can I do? do now? Google recommends to claim your knowledge panel through Google Search. This is something that Google has licensed in 2016 and that it still supports. Google has published a help document containing clearer instructions on how to update your Knowledge Panel in Google Search.
Why we should care. Over the years, many SEOs and web publishers have simply used social profile markup to manage these knowledge panels. Now, Google says that it will find these profiles in your claimed profile or by other automated means, but will no longer consult your markup for that. This means that you have to monitor your social knowledge panels during your research and see if something is changing for your profile or what you are managing for your clients.
About the Author
Barry Schwartz is the news editor for Search Engine Land and owns RustyBrick an online consulting company based in NY. He also directs Search Engine Roundtable a popular research blog on topics related to SEM