I have just discovered that I can't comment on my own blog (not this journal, a blog about games that I maintain on blogger.com). To log in, I use a Google account, which lets me write new posts, manager comments, etc. But when I try to comment, to reply to someone else, the software won't recognise the Google account. To make it work, I have to change my browser settings to allow third-party cookies. I'm not impressed.