To delete or not to delete

If one is going to abandon the use of an internet service that includes the posting of public content, how should one leave it?

There are two schools of thought on this:

Jakob Nielsen thinks content should live forever. That is, don't delete accounts as that would delete all old content.

Then there's the delete your old accounts approach. This would delete all old public content, but that's a necessary price in this age when privacy is at a premium. Content can live forever on Archive.org instead.

What do you think?