Conversation so far:
What did Nate create ?
On November 1, 2007, while still employed by Baseball Prospectus, Silver began publishing a diary under the pseudonym "Poblano" on the progressive political blog Daily Kos.
What was in the diary ?
Silver set out to analyze quantitative aspects of the political game to enlighten a broader audience.
What was the motivation ?
'I was just frustrated with the analysis.
...
I saw a lot of discussion about strategy that was not all that sophisticated.
How did the diary further develop ?
Silver established his own blog, FiveThirtyEight.com.
What did he publish on the blog ?
On June 1, 2008, Silver published a two-page Op-Ed article in the New York Post outlining the rationale underlying his focus on the statistical aspects of politics.
Did he publish anything else on the blog other than the Op-Ed piece ?
CANNOTANSWER.

Question: When did he start the website fivethirtyeight.com ?
Self-contained rewrite: When did Nate Silver start the fivethirtyeight.com website?