1. I don't see a question there.
2. Yes, it is largely a matter of preference.
4. No. Try: "I log onto Yahoo, and I chat privately."
6. Who did you get married to? or Who did you marry?
7. Keep the hyphen. It makes the writer's intent clearer.
8. Thanks a bunch!
9. It's the difference between the American spelling and the British spelling. (Say: "when they are used as verbs")
(There is no need to thank me beforehand. Instead, click on the "Thanks" button.)