I found the function "share" when I took a long-press on the homescreen icons.
But it didn't work. Is it a bug,or just a problem on my device?
No, you're not only the one I think it's a Sony rom's feature, which is not implemented in the launcher
well it works on my s2. but only some apps/icons works and some doesnt. AFAIK widgets do not work but i tried "3g watchdog" and it worked.