He could be referring to the maps on the insides of the trains, saying he used to tag them up with everything from Bic markers to spray cans.

As PackFM says

Here comes the train, dip into the last car
Put my name everywhere, even where the maps are

She received a lot of media as well as Internet attention thanks to her hit single Friday.
But she’s saying she liked it, even though she was hated on and mocked by a lot of people (including us)

A somewhat clever attempt at trying to get more users that would hopefully leave Facebook and/or Twitter, and use YouTube and Google+ more regularly.

In order to clean the comment section, YouTube enforced people to register a Google+ account before commenting.
They expected people to register under their real names (so they would be too embarrassed to post insulting comments, I guess?), but I’m not sure how they planned to enforce people to do so.

Some of these features have been available, and some of them are new.
But how can 1 person block all those people that are spamming on purpose? That would be very time consuming.

Your comment will be on top for people that have listed you in their Google+ circles. What are the odds of that happening – you and your friend watching the exact video and going through the comment section?
Obviously, you can tag your friends by adding a plus sign (+) and then their Google+ handle, which is an obvious attempt by Google to “save you the trouble” of linking your friends to the video on Facebook, Twitter, Skype, or any other social networking website/program that might represent a threat.

What YouTube actually aimed at with this update was trying to clean their comment section, as they were one of the most notorious discussion websites on the Internet (probably right after 4Chan).
However, they’ve played themselves here, by forcing changes on users, so the comment section now looks even worse than before due to massive trolling.