Fetch User Details from Facebook and Twitter API using asp.net or javascript

Fetch User Details from Facebook and Twitter API using asp.net or javascript

I am trying to fetch all the user present inside a area(area means:Los
Angeles).
I want all the user facebook and twitter user present at Los Angeles.
I searched in Google found a link for facebook
https://graph.facebook.com/search?type=place&center=37.76,-122.427&distance=1000
this is showing all the places present inside that lag and lat with 1000m
displace from that area.
This is not showing all the user present inside that area.
Please help.
Thanks in advance.