We reported earlier that Facebook was edging towards the half-a-billion mark. Now the world's most popular...well, anything has just officially gotten its 500 millionth member. Mark Zuckerberg has just posted in his blog that his site has hit another crucial milestone.
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If you'd like to read some heartwarming stories of Facebook in use, Zuckerberg has posted a few up with his blog entry, along with a video. They've also put up a thank you page where you can share your own Facebook story.