Hi,
can you please post me a screenshot of your linkedin configuration (redirect uri) and your site link?
to keep private site link you can use the form below the reply in "Site Details" tab

Hi,
Thanks for your availability, I have tried with linkedin and seems to work.
Maybe you have test it from https://your-domain.com instead https://www.your-domain.com (this is the redirect uri registered in configuration).

Your site works with and without www so you need to register both domains in LinkedIn configuration (same for twitter)

Thanks for your kind reply,
it seems to work now, I'm gonna keep testing.
I'd also ask: how to add a second url on twitter? It seems there's space only for one.
Lastly: could you tell me how could I possible push those buttons (twitter, linkedin etc etc) a bit down?
How to apply some basic css? they seem untouched by any css rule, can't find them not only with firebug....
Again many thanks indeed.

how to add a second url on twitter? It seems there's space only for one.

mmmh, yes seems that twitter allow only one redirect uri. Probably the only way to make this is to use domain only with www. Probably from your hosting panel you can redirect domain.com to http://www.domain.com

could you tell me how could I possible push those buttons (twitter, linkedin etc etc) a bit down?

To help you to make this we need to see the buttons, but now are gone

How to apply some basic css?

This is something that you should manage from your template. Seems that you use a template based on T3 Framework so you can create a file at /templates/template-folder/css/custom.css and this file should be loaded in all pages.

Thank you very much.
Well, I had to put this feature on hold, at this point I don't have so much time.
However, that's strange, I did expect the custom.css file would work, but it seems it doesn't apply to the offline page...
that must be something about the template for which I have no time now.
I'll post on this thread as soon as I have time.
Again many thanks for now.