1) I'm not sure if it's the first novel tipping episode on tapas, but it seems to be the first in this thread for sure.
Also, it's in form of a poem!
2) Yes, 'Im okay if it's used for advertisment, even though I don't know how you would use novel episodes for that ^^
3) I think the big tipping hype is already over, so I don't know what to expect now