Thanks for reply.

I need data for research, I'm still in beginning my work.
One of reseatshers told there is a link in which dataset for reseach work.
it is not necessary from real world,but I did not find it or I did not know how find it.
just to see it, then I can know how I can do .
in fact my work relate with access control in social networks.
if you can help me I will apprecaite that.