Conversation so far:
What did Jimmy Fallon do upon Jimmy Fallon's return?
Fallon proved himself different from other late-night hosts, with more of a reliance on music, dancing, impersonations, and games.
Are there any other interesting aspects about this article?
his incarnation of Late Night "evolved into the most deeply musical of TV's musical-comedy variety programs".
Why was he arrested?
CANNOTANSWER.
Was it successful?
Coincidentally, it was during the Tonight Show debacle that Fallon's show found its footing.
was there any scandal?
Producer Michael Shoemaker felt that the show's style solidified when it used Susan Boyle as a joke.
did he face critic?
It was this style of humor, that Adam Sternbergh of New York dubbed "the comedy of unabashed celebration", that led to the program's success.
did any thing else happen coming back?
Another component built into the program was its association with social media and the Internet.
how did he take to social media?
The first majorly successful online clip was of Fallon and Justin Timberlake performing a "History of Rap".

Question: When did that air?
Self-contained rewrite: When did the Jimmy Fallon and Justin Timberlake clip, "History of Rap" air?