I can share links from my website on facebook before. But now I don’t know what happened, I get an error saying: “Failed to get composer template data.”
Your website appears to be down completely, so it might explain why Facebook can’t get any data from it.
To enhance social sharing we use SEO by Yoast which adds open graph information for your website. Most social sharing plugins does the same thing. For example Jetpack’s social sharing module does have open graph info.
Let me know if you need any further assistance with this.