Thanks a lot for your response,
Regarding the speed of the Sitewide activity page.
When i activate the plugin Buddypress plus, the sitewide page is verrrry slow.
But the problem here is when i deactivate it, the sitewide page is really fast.
I also have another subdomain using buddypress plus on THE SAME HOST and the sitewide page is ok.
I do not know why is the reason and how to solve this.
About sharing Video and Link, i tried to test on the default theme, it is still not working. And the same problem with another subdomain on this host.
I already asked about sharing problem, but not solved until now.
A member of your team mentioned about: allow_url_fopen
I asked the host provider to open this, but i am not sure about it work for all subdomain or not, i just know that they open for my host
Thanks for your time and consideration.
I am looking forward to hearing from you,