presale questions: fan gate and easyblog post

1. fan gate a joomla article, user must like the FB page before they can see the article

No, this is not possible. It is against Facebook's terms.

2. auto post different category of easyblog posts to different FB pages.

Yes we support this. First, you'd create an Open Graph object in the JFBConnect backend > Social Meta > Objects area for each of the different categories in EasyBlog that you want to post for. Then you'd create a separate channel in the JFBConnect backend > Channels for each of the Facebook pages. In those channels, you'll then select the appropriate object to map the category to the channel for autoposting.

-Melissa