For both images and movie content specifically?

Do you think that there is a certan 'timeframe' associated with content and its effectiveness also, if you do, how long do you think it is between the content becoming 'stale' and becoming 'fresh' again on the net?

Also, what dictates content becoming 'stale' the amount of time it has been around or, the amount of people that have seen it?

Your thoughts?

Regards,

Lee