Well, even if I still don't have the blog adapted for lack of time as usual to use the secure protection layer or SSL, many of us have had to inform our users of what we do with the data we store. In my case, I don't store any information about my users other than Google Analytics to see how many people enter on this blog and from where. For now I've disabled it because I don't know if I should do anything else on the blog in order to have it (anyway, it's always blocked by the adblockerks we all use and I never know for sure if it's true).
If in the past I have held a contest where I stored e-mails, they were deleted within one month of the end of that contest, so you don't have to worry about anything. The comments are managed through the Disqus platform and from there you can exercise your right to delete the account.
If you want more information, I leave you with my page about data protection here.
And since I've informed you about it, I'll let you know that this week I've reach over a million hits and I'm thinking about something cool. Suggestions are welcome.