If you build up your website with a like button or a connect feature you could be interested if facebook index all relevant information of your webpage in the right way . For that Fb has a Tool the URL Linter

https://developers.facebook.com/tools/lint/  

Ater your chek you can add or correct the missing metadata . Facebook social search engine dominates already Google and its important to be indexed correctly. Don't forget to take a look at your Bing search result as its the websearch build in Facebook .