As Terry Pratchett said
"Rumour is information distilled so finely that it can filter through anything"
No currency or stock is totally immune to it. The value we assign to stocks, bonds or currencies is very much based on trust (or confidence, if you like). Rumour can shatter that confidence, or at least shake it sufficiently to wipe out a large amount of the assigned value. If I held any bitcoins I would be seriously worried.
I would go for Flainian Pobble Beads any time, and I have almost got one ningi (quite a way to go before I can deposit my first Triganic Pu)