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It is allowed. There are differing views as far as whether it is good etiquette. Lots of people do it though, so it is up to you.

Also, when should I upvote stuff? How do I know if it is gonna bring --anyone-- any rewards?

time to go check those tutorials out eh? OMW! xD

The FAQ and welcome page both have a lot of good info.

Thanks a lot, I've been so tied up with all the innards of posting and curating that I've forgotten to actually go check those out... Nice reminder --and timely!