What is the current way of obtaining bonus space in my Dropbox?
You can get space using the following methods:
Install the desktop client for the first time and you should receive 500 MB of space.
Promotions available through various brands of phones (eg. Samsung)
Use Referrals to obtain a maximum of 16 GB of space using the following link: https://www.dropbox.com/referrals
Follow the Getting Started instructions to obtain more space: https://www.dropbox.com/gs