Crowdsignal surveys and quizzes can be shared on your Facebook page or feed, just like any other link. Simply edit your survey or quiz and click on the Share link and navigate to “Direct Link”.
Click on “Copy to Clipboard” to copy the link and then paste it into a Facebook status update.
If you would like to modify what Facebook displays when your survey or quiz is previewed you will need to edit your survey or quiz again. You may need to clear the cached copy Facebook keeps as well. You can find more information on the Customize survey sharing on Facebook support doc.