I will not sell your information. Period.
Having said that, I may use Gravatar or Discus or CommentLuv or Facebook or Twitter comments which may connect voluntarily to some aspect of your online persona. This will all be profiles you have voluntarily set up in the hopes of connecting online. Up to you whether you choose to use them on this blog or not.
I may ask you to register as a user on this blog so you can have commenting privileges.
I may have ads running on this blog and those ads may track whether you clicked on them.
I may ask you questions and you may choose to answer them and your answers may be read by other users of my blog.
Search engines may spider this blog (hopefully) and will record what you and I say here for others to discover via a search engine query.
I do not feel that any of these things violate your privacy. If you feel they do, please do not make any comments on this blog. If you do comment on this blog, please be assured, I will not sell your information to any third parties. Period.