Related Clues:
- Eager volunteer's cry
- Fast-spreading Internet phenomenon
- Enthusiastic volunteer's cry
- Frequently shared thing
- Piano-playing cat, once
- Voguish thing
- Twitter trending topic, maybe
- Cultural fad
- Lolcats, e.g
- Social-media phenomenon
- Passing event?
- Endlessly lose strength during craze
- Craze, fashion
- Repeating oneself in something that might go viral
- Fast-spreading idea