This won't work because the Account model only receives the message, core is who receives the account_id and the message. What do you think of something like this:

```python
if cuenta not in cuentas_registradas:
    a = Account.new('twitter')
    url = a.request_oauth_access()
    print "Por favor acceda a la URL, inicie sesión y escriba a continuación el PIN:"
    print url
    cod = raw_input("PIN:")
    a.authorize_oauth_access(cod)
    c.register_account(a)

print c.update_status(cuenta, "Probando desde libturpial")
```