Top 10 MMORPGs by player numbers

Kotaku recently published a list they discovered of the 10 most played online RPGs. Although the terms of how each game considers a player to be “active”, or not, tends to bring up critiques, this list was quite surprising considering that I haven’t even heard about a couple of these titles:

1. World of Warcraft, released 2004 – 8.5 million subscribers.
2. Habbo Hotel, released 2000 – 7.5 million active users.
3. RuneScape, released 2001 – 5 million active users.
4. Club Penguin, released 2006 – 4 million active users.
5. Webkinz, released 2005 – 3.8 million active users.
6. Gaia Online, released 2003 – 2 million active users.
7. Guild Wars, released 2005 – 2 million active users.
8. Puzzle Pirates, released 2003 – 1.5 million active users.
9. Lineage I/II, released 1998 – 1 million subscribers.
10. Second Life, released 2003 – 500,000 active users.

I’m really surprised that Ragnarok Online isn’t in this chart, then again, I haven’t played many MMOs recently except for World of Warcraft. Do you play any of these MMOs?