social buttons

Hello
When the facebook like button from Social buttons is pressed on homepage, on that person fb page appears the wordpress logo. What do i do wrong?
thank you

My homepage is an archive page with lasts posts.
Is that why the image facebook grabs is the wordpress logo? Because I donțt have a featured image and a post image, but an archive?
Where can I change the wordpress logo with my logo?
thank you

Anybody?

Hi!
Could you give us the URL of the page?