I’m having trouble sharing the link to my web page on Facebook/LinkedIn. What to do?
If you don’t have much textual content on your page, add the blurb that Facebook/LinkedIn should pick up in the meta description tag of your web page.
If you want Facebook/LinkedIn to also pick up an image, then add one on your page. Make sure to provide its source in an <img> tag, not as the background image for another element.