Conversation so far:
What is Fallon's online presence?
Fallon dove into the Web prior to the show premiering, creating a Twitter account and beginning a vlog on the show's official website.
Did he get a lot of followers?
Many of the videos received a very high number of views.
What video was the most popular?
Jimmy Fallon & Justin Timberlake" clip that had garnered over 17 million views by October 21, 2013.

Question: What other online platforms is Fallon on?
Self-contained rewrite: What other online platforms is Jimmy Fallon on besides Twitter?