https://db.tt/qkRgjVC

3) Complete at least 5 of 6 easy getting started tutorial steps at https://www.dropbox.com/gs - 250MB
4) Complete the tasks at https://www.dropbox.com/free
4a) Connect your Twitter account with Dropbox - 128MB
4b) Connect your Facebook account with Dropbox - 128MB
4c) Follow @Dropbox on Twitter - 128MB
4d) Send a one line comment about why you love Dropbox - 128MB
4e) Tweet about Dropbox for more free space! - 128MB
5) Refer new users who register AND install the Dropbox desktop client - 250MB per referral up to 8GB
6) Link your account to a .edu email address at https://www.dropbox.com/edu - doubles storage referral bonus (retroactively as well) to 500MB per referral up to 16GB