Perhaps something like this:

Code:
alias talk {
  if ($network == network name here) { 
    var %n = $scon(0)
    while %n { 
      if ($scon(%n).network == second network name here) && ($scon(%n).network == third network name here) {
        scon %n amsg Twitters | return
      }
      dec %n
    }
  }
}


Then type /talk to trigger the script