The Like Box is a special version of the Like Button designed only for Facebook Pages. It allows admins to promote their Pages and embed a simple feed of content from a Page into other sites.
in this case it likes the spidro.website facebook page.
The Like button is the quickest way for people to share content with their friends.
A single click on the Like button will 'like' pieces of content on the web and share them on Facebook. You can also display a Share button next to the Like button to let people add a personal message and customize who they share with.
you can disable & enable the share button.
for shares there is a tester to see what gets shared: Test what gets shared
Embedded Posts are a simple way to put public posts - by a Page or a person on Facebook - into the content of your web site or web page. Only public posts from Facebook Pages and profiles can be embedded.
The Comments box lets people comment on content on your site using their Facebook profile and shows this activity to their friends in news feed. It also contains built-in moderation tools and special social relevance ranking.