Happy Blog Birthday!

Today I have been blogging for 4 years. I started this blog on January 7, 2002 with the following words:

OK. This is the first time I've done this. I thought is was a good idea, based on what I've read elsewhere. I am so new to web-building and web publishing, and I am so happy that a forum exists for me to type what's going on inside my mind.

Question: Is it possible to identify how many websites are actually available on the Web?