I can't share a specific domain to facebook

For 8 days I've been unable to share posts on my site to Facebook. What does it mean? If I try to share my site (on my wall or on a page) it seems to be successful, but the post (that contains a link to a specific domain, i. e. the domain of my site) doesn't show up on my friends' walls (or on the fans' walls). The post is visible, but only in my Profile or on the fan page. I'm definitely able to share any other link, so my site seems to be blocked, but in this strange way. I didn't get any notification about blocking this site. My site is tani-tani.info, it is in Hungarian. It is an education related site with no problematic content. Any idea? Thank you in advance!