public static string SessionKey
    {
        get { return GetFacebookCookie("session_key"); }
    }

    private static string GetFacebookCookie(string propertyName)
    {
        var fullName = ApiKey + "_" + propertyName;

        if (HttpContext.Current == null || HttpContext.Current.Request.Cookies[fullName] == null)
            return null;

        return HttpContext.Current.Request != null ? HttpContext.Current.Request.Cookies[fullName].Value : null;
    }