"I think our challenge is that line from destructive criticism to constructive criticism, because there is going to be criticism, " Markos Moulitsas, founder of DailyKos.com, said in a recent interview.

CNN: Preston on politics: Blogging in the Obama era

However, they've also become the target of criticism that they're a destabilizing--or even a destructive force--in the markets as well.

FORBES: Magazine Article

It is perhaps a laughable commentary on the current mania for monetary stimulus that this feature is what seems to have inspired the most criticism of Bitcoin.. The knock on Bitcoin is that its fixed nature will cause an inevitable destructive deflation.

WSJ: The Weekend Interview With Gavin Andresen: Bitcoin vs. Ben Bernanke