All the credits of this snippets goes to the original poster: Daveoh, and the original work can be found here: http://www.hawkee.com/snippet/2041/

I edited it with wildcard for automatically catch every url on the chan and convert it into a tinyurl. You can think this edit is useless, but on my chan is really appreciated.

I've removed all triggers, and of course need to loaded on a bot.

Cheers
essebi

on *:TEXT:*http*:*:{
  if (%tinyspam) { halt }
  if (*http://tinyurl* iswm $1-) { halt }
  set -u3 %tinyspam 1
  set %tinyurlchan $chan
  var %tinytemp $1-
  set %tinyurl1 $wildtok(%tinytemp,http*,1,32)
  if ($sock(tinyurl)) { sockclose tinyurl }
  sockopen tinyurl tinyurl.com 80
}
alias tinyurl { 
  set -u3 %tinyspam 1 
  set %tinyurl1 $1 
  if ($sock(tinyurl)) { sockclose tinyurl } 
  sockopen tinyurl tinyurl.com 80 
} 
on *:sockopen:tinyurl:{ 
  sockwrite -n $sockname GET /create.php?url= $+ %tinyurl1 HTTP/1.0 
  sockwrite -n $sockname Host: tinyurl.com 
  sockwrite -n $sockname user-agent: Mozilla/?? 
  sockwrite -n $sockname Connection: Keep-Alive 
  sockwrite -n $sockname $crlf 
} 
on 1:sockread:tinyurl:{ 
  :nextread 
  if ($sockerr > 0) return 
  sockread %temp 
  if ($sockbr == 0) return 

  if (<blockquote><b>* iswm %temp && $left($replace(%tinyurl1,&,&amp;),15) !isin %temp) {
    set %tinyurl2 $remove($gettok(%temp,2,60),b>)
    if (%tinyurlchan) { msg %tinyurlchan %tinyurl2 }
    else { echo -a Accorciato in %tinyurl2 }
    unset %tinyurl*
  } 
  goto nextread 
}