:
I investigated the source code and found something.
". p" was interesting for me.
I thought it might be a picture with .png so I tried
http://www.oddworld.com/soulstorm/ed/witness.png which is this.
14245
Have fun.
(I finally found a step in the ARG, goal completed!)
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Nice work Pirfsich!!

This looks tricky.
Now I really want to understand
why it's witness.png, and how the formatting and Ed's tweet would have led us to that.
So I think it's safe to say that this is based on puzzles from the game "The Witness", so this page will probably be helpful for those (including myself) that have never played it:
http://uk.ign.com/wikis/the-witness/Puzzle_Types
It lays down some ground rules that I believe are used in our puzzle, for example:
Hexagon Dots

In order to complete puzzles that feature these tiny black hexagon-shaped dots, the line you draw must intersect with each one along the way before reaching the end point. Think of it like connecting the dots! You must connect all the dots before reaching the end point for this to work.
If the dots appear in different colors, it means you have to collect those dots with a line of the corresponding color – so blue lines can only get blue dots and yellow lines can only get yellow dots. Black dots can be picked up with lines of any color.
So, in our puzzle, the small white dots will have to be picked up by a white line. Furthermore;
Black & White Squares

To complete puzzles that feature black and white squares, you must use the line to "separate" the different colors. Think of the line like a wall, where only black squares can be grouped with other black squares, and only white squares can be grouped with other white squares. The edge of the grid counts as part of the "wall" you're drawing.
Squares don't have to be paired with all the squares of their same color, meaning it's okay to isolate them by themselves if necessary. Squares just can't occupy the same space as a different color.
So we'll have to separate out the black and white squares in our puzzle, too.
There's quite a lot of into on how the suns work within the puzzle, so I won't copy and paste that over.
Also, more from Ed: