(SOLUTION POSTED) PUZZLE! PUZZLE! PUZZLE!

Welcome!
The game is Bioshock and there's no CV required. You have 5 days to solve the puzzle.
So here it is: This is given to you as the first step. You have to find 8 keys that lead to the puzzle. Look everywhere, in any place that connects with me. Also, I'd like to mention that imgur.com is a cool site and I like it.
If you want to listen to some quality music, here.
Don't post any hints or links to stuff you find, it ruins the fun.

Thanks for participating everyone, I hope you had fun!
Here's the solution:

1. Firstly and most importantly, you had to guess your age. The link to the question is hidden in the exclamation mark after "Welcome".
2. After that you had to find 8 keys which are images in imgur, the seven letters from the links are hidden in the following places:
   2.1 The first one was hidden in the source code of the page.
   2.2 The infamous second one was pronounced in the middle of the "quality music" that I gave you.
   2.3 The third one was hidden in the dot after the youtube link in my comment.
   2.4 The fourth one was hidden as a spoiler in my steam profile.
   2.5 The fifth one was hidden after the "-" in the youtube link.
   2.6 The sixth one was in the title of the "quality music".
   2.7 The seventh one was the title of the third one but you had to decrypt it with rot-13.
   2.8 The eighth one was the title of the first one.
3. Once you had all the images, you had to copy them and place them on top of the given image. This could be done easily in paint. The letters lead to links in itstoohard.com. All letters from the same color lead to a different puzzle and the number of the image indicates the order of the letters.
4. There are 5 puzzles in total, each of them has just 1 question which is a riddle.
   4.1 Riddle 1. You can watch this if you're curious. Really interesting.
   4.2 Riddle 2 is pretty self explanatory. :D
   4.3 Riddle 3. Zero degrees Celsius is not an absolute temperature, so you had to convert it in Kelvin and multiply it by 3 (546.3C or 819.45K).
   4.4 Riddle 4. I'm lying. Obviously. :D
   4.5 Riddle 5. 1+19+80=1, because One + Nineteen + Eighty= ONE Take the first letter of each number of the second equation and you get TEN.
5. Each riddle gives you one of five parts of an image that shows the last question. It also gives you the link to the final puzzle(which you could guess without having the exact question).
6. The name of the girl is Juliett. The reflected sound is "Echo", the dance is "Foxtrot", the ball sport is "Golf", the place to stay is "Hotel", and the country in Asia is "India". These all are letters in the NATO alphabet and "Juliett" is after "India".
7. The reward you get for solving the puzzle is this link: http://www.steamgifts.com/giveaway/saYOo/half-life-3-game-of-the-year-edition .

Hope that you all had fun with this puzzle. New puzzles coming up soon. Drive safely.