From somedays i am looking that i can not share my post to facebook. I can share any other blog post. But i can not share my blog post. But what is the problem...?
your site is working properly on Facebook right now. It might have been a plugin or Facebook too. When you post one same URL on your facebook wall and in any other facebook pages then facebook tends to ban your link for a little while. It has happened to me and to a lot of people I know. We will never really learn how Facebook works when it comes to marketers online and their websites. But hopefully you have fixed your problem completely. Much success!
Auto-posting links is very convenient, but I've found that posting links manually tends to make people more aware of what they're posting. Also, sometimes it will motivate you to add something a little more "personal" for each social network, like a little introduction to the topic you're writing about, for example. If you don't post TOO often, you could try that. Also, if ever that plugin doesn't work, you'll be used to doing things yourself.
Facebook official WP plugin is a great one to publish your WP post on FB timeline and Fan pages. You can try it. I use it in my blogs. I love it too much.