Open Web Page inside Html Widget to share contents

I'm trying on my IPad ( IOS 5.1.1) the following html widget for social sharing https://github.com/avk/iBooks-Social-Widget

I see clicking on twitter button a page is open by safari browser. It works fine.

But clicking on Facebook button or Google+ button relatetd pages aren't opened by Safari but seems opened directly by widget.

So is not possible to scroll Facebook page and is not possible to come back. I can only close iBook to come back.

Do you know, why sometime the Safari is opened and sometime not, how is possible to work around this issue?

Other thing, can I use Url Schemes to share contents on Facebook? What is the command to do this choosing- text, title and thumbnail fields?

Tks