Comment # 5 on bug 907403 from Mark Fairbairn

quoted from dropbox help center

"Please note: We have a new, better way to share links to files and folders
from anywhere in your Dropbox! Now all you need to do is select Share link from
your computer, phone, or tablet. Quickly share anything with friends and
colleagues���even if they don���t have Dropbox. Learn more here or go to this
article to see how it works.

Because of this new sharing model, Dropbox accounts created after October 4,
2012 no longer have a Public folder. Don't worry! Every account created prior
to this date will still have a Public folder. If you'd like to enable a Public
folder on a new account, see the instructions below (Creating a Public folder)
to learn more."