Actually this is mine aproach to do something webbish with bittorrent sync.
I do it because lots of people who don't understand what to do with this "secrets".
So I randomly set the ID in the URL to http://btsnc.at/11 and got a secret: RXSYSTTQYRSRY4PU7DMW32GUVXOBHI4GX
Is that a valid secret.. I don't know. But if it is.. then not much of a secret if I can get one by just guessing btsnc.at URLs!
Well. This is your choice to PUBLISH your "secret".
As you can notice usualy everybody write "secret" with quotas. Because "secret" is realy not so "secret".
If you publish your ssh key than it wouldn't be a secret either.