To celebrate Blogger's 11th birthday, Google is encouraging bloggers to get together and celebrate on Aug 31. They have a signup page at Meetup Everywhere for Blogger Fiestas all over the world. I don't know how many bloggers out there use Blogger, but I imagine it's more than the 492 people currently listed as attending these parties. The really sad part, though, isn't the total number of people attending, it's the size of the parties. I made a histogram of party size:
Note, that the horizontal scale is logarithmic. That means, that the bins get larger as the party size increases. Close to 70% of the parties have only one person attending, 90% have less than 5. For such a huge userbase, this is a pretty epic fail.