For general feedback about the game.Steam Support
Visit the support site for any issues you may be having with the game or Steam.
The good folks at Yogscast are hosting their annual Jingle Jam charity fundraiser, which has raised over $400,000 so far! Yogscast will be holding livestreams during all of December, with all the money they raise going to Doctors Without Borders, End Polio Now, Oxfam, Fauna & Flora International and Special Effect!
Anyone donating more than $5 will receive the TF2mixup Thought that Counts. If you donate more than $25, you will receive 14 games, including Awesomenauts, Mark of the Ninja, Magicka and Thomas Was Alone.