I see this happen all the time to businesses where when someone shares the link to their website a generic or no-image photo appears.
Sharing your website on Facebook happens when someone clicks a “share” button or posts the URL to your shop into a new post on their Facebook timeline.
This content is always shared as a link to the web page, but it may also include an default image or no image depending on what Facebook scrapes from your site.
We're here to help you get this fixed using our Facebook Debugger for Developers tool along with specifying which image Facebook scrapes from your site.
Go ahead and try sharing your site to Facebook and leave a comment below with what you saw.