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I know this isn't a big deal for me but why do guests get to post answers but not post questions?

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This restriction only applies to Stack Overflow (and a few other Stack Exchange sites*); you don't have to register to ask questions on most other sites in the network.

The change was made because Stack Overflow has grown in popularity and the number of hit-n-run questions by unregistered users was getting out of hand. It's a quality control measure.

See Encouraging users to create an account (and keep it) as well, specifically Jeff's follow-up comment:

@eds it still works, just not at the scale of Stack Overflow. And to be brutally honest, the important part is unregistered answers; we don't really care about putting barriers in front of question askers. See http://blog.stackoverflow.com/2011/06/optimizing-for-pearls-not-sand

*The complete list of sites requiring a login to ask a question is:

  • I guess maybe because Stack tends to want better questions rather than answers? – puretppc Mar 29 '14 at 2:50
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    Why is it even allowed on other sites anyway? Registering doesn't really take more than a few seconds and if you're not registered, you just don't ever return to your question, simple as that. But I guess there's already a meta question on that issue. – Christian Rau Nov 7 '14 at 9:31
  • Having to register just to get one question answered is absurd. Just create an Anonymous bucket and let it go at that. If someone tries to ask another question, then ask them to register. – user291305 Dec 19 '16 at 14:54

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