(Thanks to f'' for the help in chat! He solved the majority of this puzzle - I just came in at the end.)
Step 1: Crossword
The crossword was solved by feelinferrety, Z. Dailey, and Sleafar:
Step 2: ...
To elaborate, ASCII is a standardized representation of text which assigns a numeric value to 128 different characters.
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When you single click on a stack exchange site (i.e. Stack overflow) it gives you the number of questions on that site.
I just did this with every site and added them all up. The answer is there are ...