Facebook Share Default Title

I have the ibegin-share plugin installed. I use the facebook share feature, and I was wondering how I change the default from Telthorst.net ? Blog Archive ? *Post Title*

To either:

Telthorst.net ? *Post Title*

or just the *Post Title*

I’d also like to know if you can set the default image to nothing.

Thank you in advance for any assistance you might be able to provide.