Why did Aragorn not tell the Company that Gollum was folling them?

[The Mouth of Sauron]

Aragorn knew that Gollum was following the Company from Moria onwards, but said nothing till he informed Frodo 2 or 3 days out from Lorien. Why wait?

[Inziladun]

Because he remembered this thread (http://forum.barrowdowns.com/showthread.php?t=16257). ;)