If you react to a post or fill in the information form you will send personal data. This data is stored (on a server in the Netherlands), not validated, and not shared with 3rd parties. By leaving your e-mail address you allow me to send you e-mail when appropriate. I will not use your e-mail address for spam, mailing lists or other purposes. If you so request I will erase your personal data from the database.
The information stored is name, e-mail address and IP address. Note that it is easy to fake any of these, although if you would like a response I suggest you use an e-mail address you actually can reach.