Twitter is supposed to be real time so in reality the url only needs to last say a few weeks to really be viable even for search so if there is a pollution of some dead links over time, who cares its not like it is anything new and you should be able to google it by then.
Twitter is supposed to be real time so in reality the url only needs to last say a few weeks to really be viable even for search so if there is a pollution of some dead links over time, who cares its not like it is anything new and you should be able to google it by then.