Facebook Deprecating Like Box on June 23rd 2015. With the release of Graph API v2.3, the Like Box plugin is deprecated. Please use the new Page Plugin instead. The Page Plugin allows you to embed a simple feed of content from a Page into your websites.
If user do not manually upgrade to the Page Plugin, user Like Box plugin implementation will automatically fall back to the Page Plugin by June 23rd 2015.
The Page plugin lets you easily embed and promote any Facebook Page on your website. Just like on Facebook, your visitors can like and share the Page without having to leave your site.
Get your Facebook page plugin code from here