2. December 3, 2008. That's when that article was published about giving notice and starting to find replacements. Same as every other president does.
3. Serious question. Are you paid to do what you are doing right now? I have a really hard time understanding why you would post that link which is specifically framed to spread misinformation as it is about a completely different point in the presidency. Seriously, this is your country. Why would you intentionally attempt to misinform your fellow citizens?
EDIT: I expect a response. You said Obama did the "exact same thing". Which is an outright falsehood and posted an link that is from a different period to intentionally misinform people. In some countries what you just did would be considered a crime.