Hi,
Thanks for contacting us here about this extension.
1) Is it possible to publish in the Socialnetworks to which you component can nonnect to from a Easyblog (from stackideas) Post?
Our Social Backlinks is not integrated with Easyblog currently.
2) Imagine an article is quite large is there a way that a portion of that article get´s posted with a link back to the joomla website to read the entire article?
It depends on how the social networks generate, we just send the meta tag. This is not possible with normal Joomla articles.
As my experience, it will be displayed as a small square thumbnail on facebook for example with K2, Hika product,...
Hope this helps!
Best Regards,