Why are preview images, titles, and text not included within shared posts?

Preview images, titles, and text are dictated by HTML formatting.

Facebook

For Facebook, Open Graph Tags must be applied.

Read more about Open Graph Tags.

Confirm Facebook link previews with Facebook's Share Debugger.

Twitter

For Twitter, Summary Cards must be embedded in an article to include previews within shared Tweets.

Read more about Summary Cards.

Confirm Twitter previews with the Summary Card Validator.