Did you (or will you) use TurboTax by Inuit to file your taxes this year?  They also make QuickTax, which I think is just the Canadian variant.  Anyhow, they want to make more money than what you pay them for their software each year.  To do this, they sell your tax information to advertisers!  Yay!

http://y42k.wordpress.com/2014/03/18/turbotax-sells-access-to-your-data/

I use StudioTax, which is free and claims not to harvest your information.  http://www.studiotax.com/en/