Create User with user-level filters enabled:
curl -i -X POST -d "userGroups[]=Default&user=a17@a.com&ssoCustomerToken=9ebdlklfWlYuQXPXanqHxq7ZflklfZ1pGC8Ny8l2is9uNhMie&contentFilter=[{\"fieldName\":\"customer\",\"values\":[\"LinkedIn\"],\"operator\":\"=\"}]" https://www.knowi.com/sso/user/create
Then create the session token and iFrame the URL with the session token like in the example above.
More on User level filters here.