Arnoud is correct, I had same error and then I use
htmlentities($tweet) and it works now, my OAuth application posts the
tweets automatically and correctly.

On 24 mei, 17:22, Javier Solís <jso...@tssolutions.co.cr> wrote:
> I when is sent a update status call with OAuth than  include special
> characters like óíú...  Twitter raise a 401 error.
>
> I tried with diferent encoding  tricks,   and stop the error 401, but the
> characters cannot display fine in twitter  status.
>
> If you know a new version of OAuth withot this problems, please tell me.
>
> Thanks

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