Compilations - Major Time Waster

I don't know when these started - but they have taken off in the last few weeks.  "These" are compilations of various snippets of musical theatre songs. Some with amateurs. Some with professionals. Some with people in between. Some are mean. Some are spectacular.  Many say they are in the "spirit" of Emily Whitlow who did a compilation of women screaming "Christopher Columbus" from the song "Astonishing" from "Little Women." 
In any event, some enterprising person or persons has brought together many of these compilations on a facebook page:
Musical Theatre Compilations

I apologize in advance for the amount of time you may spend viewing.