Ok i found the problem, i have the more privacy option plugin installed, so if i set the value to blog only member i have the blog post showing in the activity stream.
So i think it would be fine for me to modify the code in order to change where is defined to set hide_sitewide = 1 for private blogs (extending to member only blogs)
Anyone knows where in the code this is checked?
Thank you
It doesnt work even if the blog is no googlable or set to blog members only i have the activty stream for every user, of course when i click on the link it says the user has not the permssission to read that page.