Facebook uses its own criteria to decide which images and texts to display in the preview of a shared link.
Help Facebook decide
The image that you want to appear in your Facebook Preview shouldn’t be too small and has to be at the very top of your Dolphin website.
If you decide to replace the picture that’s currently being previewed, it’s possible that Facebook will continue to use the previous image. To bring the Facebook Preview up to date, you can use the Facebook Debugger.
Use Facebook Debugger
- Go to: https://developers.facebook.com/tools/debug/
- Enter the URL for the website for which you’d like to update the Preview and click on Debug
- In the following window you can click Scrape Again
- Your content will be updated