Snowden Leak Suggests NSA Is Extensively Tracking Bitcoin Users :The U.S. National Security Agency (NSA) has been reportedly monitoring the bitcoin blockchain with an eye on identifying users on the distributed network.
Link for details news:https://www.coindesk.com/nsa-reportedly-eyes-to-scrap-bitcoins-anonymity/
I don't think it's a good or bad news because as far as I know bitcoin is anonymity digital currency.
Tracking bitcoin users ? How it's work? I mean everyone can track as long as you know the wallet address. Honestly I think it's lossing a privacy to all users of bitcoin.