I'm a volunteer mod at the official steam forum and a huge Civ fan. (sounds a bit confessional) And... apparently, a glutton for punishment, or so we'll find out in this thread.
That said, please post any questions you have regarding Steam. I'll add them into the OP and give links to the Steam page as need be.
My goal is to be helpful in terms of giving factual information about Steam to dispel misperceptions and hopefully help you have a good experience w/ Civ5 on Steam.
Rules:
1. If you want an answer post in a civil and reasonable manner.
2. Its OK to be critical so long as you follow rule #1.
3. Any uncivil or inappropriate questions will be directed to the mod staff for removal and/or appropriate disposition.
4. No questions about things that are business decisions on the part of 2K or Valve. For example, pricing, release date, etc... these don't have anything to do w/ how steam works and are beyond what I can answer.
5. No questions on other games, IE "WTF is what that TF2 update?"
Notes:
1. I work F/T, have kids, etc... so if it takes me a couple days for an answer or two, please be patient.
2. As I said, I'm a VOLUNTEER mod. I'm not paid by Valve nor do I speak in any official capacity for them.
Useful links:
General Steam Support
Steam Forums
Civilization forum in Steam Forums (all games are handled in 1 forum)