What's this all about?
IP-based check-ins! Without signup. Messages you post will appear on your ip page.
Who can read my messages?
Public messages are visible for everyone. Private messages can only be viewed by yourself and other people with the same IP-address.
For example, when you're at home, private messages are only visible for you and your family, but when browsing from a university or company, private can sometimes be pretty public, because you're sharing your ip with a lot of other people ;)