Currently if you share a Wikipedia page on various social networks the article doesn't display well. To remedy this we should show an image and a description (see related task T142090)
=Acceptance criteria =
 og:image meta tag is added to all pages in main namespace (probably via TextExtracts extension)
 og:image is only added if a feature flag is enabled
 Verify the description shows up in WhatsApp, Facebook and Twitter shares.
== Previous task description ==
During the New Readers workshop, we learned that Wikipedia links don't display well in Whatsapp. This is also true on other websites. Apparently this is solvable by updates to metadata.
I will do more research at some point, but maybe you know something and we can expand on this.
@JKatzWMF says there may be an existing task for this.