Does your blood type affect your personality?

A few days ago while I'm on my way to work, I'm idly browsing through the BBC news web site on my smartphone when I spot an article titled Dating by blood type in Japan. I've never heard of this before, so when I get to work, I immediately send boyfriend T an email to ask him what he knows about it. Later that morning I get his reply:

Actually, I once saw a movie called "My blood B type boyfriend" which was quite a success in Asia. This blood type thing seems more important for women, especially teen girls. I have never been into this. I think it is a very silly thing!

But just for fun, have a look at this website and guess what my blood type is. Any thoughts?

When I open the web site I immediately look for my own blood type (type O), and see that it describes me as "Outgoing, energetic and social, ... extremely self-confident". I've been called all those things in the past, so I start wondering whether there's some truth in the concept :-). However, although I think I know boyfriend T quite well I guess his blood type wrongly 3 times, so maybe it doesn't stand up to scrutiny after all!

Do any readers have any views on this subject?