Well lots of sites log your IP and your IP can also be sniffed off your WAN from people in your general vincinity or even through emails you have sent. If you want to protect your identity I would use a system like I mentioned before hand at all times your connected to the internet however just having your IP address isnt a massive deal security wise its only a concern if you do not wish to be known, but I would make certain your router is secured very well. Most sites that are reputable use https connections which make them a lot safer I would advise looking for the lock icon and https:// in the begining of urls your using sensitive information on. Also your email address can be a big gateway into every thing else if you use the same one to log into all your accounts I would highly advise using different passwords for every thing and if your really super concerned using a different email address for solely for things like paypal or any form of online wallet say a btcjam like site I know a lot of btc gambling sites store coins for you on site. I think that those accounts would be the ones that would be targeted. Hopefully someone else can step in here and give you a more definitive answer thats all I know. GL