For its part, Tumblr is working hard to prove it still has indie cool street cred.
If the bail-outs work, it will be hard to prove conclusively that they were needed.
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Intent is the pivotal question, not success, and intent is really really REALLY hard to prove.
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Mr Krugman may be right but, as he admits, it is hard to prove.
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The claim that Visa and MasterCard do not compete vigorously will be hard to prove.
In the past, vote-buying has been hard to prove because of the difficulty of obtaining evidence.
It's very hard to prove that organic or free range really is what it claims to be.
That is hard to prove, based on the anemic rate of GDP gains and persistently high unemployment.
And with Libya, as with Iraq, the proliferation charge is hard to prove, and harder to disprove.
Governments seeking relief found it hard to prove to the Bank and the Fund they deserve it.
So, why would it be hard to prove Deloitte missed something big and should be held accountable?
It may be hard to prove in court that losses stemmed directly from poor underwriting, not economic turmoil.
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Easily done, but a young country has to work hard to prove it means to stick by such rules.
Seasoned regulators admit that it will be hard to prove that Wall Street firms were systematically up to no good.
As for the telephone calls, it will be hard to prove that he knowingly broke America's insanely complicated campaign-finance laws.
It is hard to prove in prison that you are a reliably reformed character, and releases are running at just 5%.
On Monday, tennis icon Martina Navratilova backed efforts to rid tennis of corruption but conceded that match-fixing was hard to prove.
Donald is going to work hard to prove folks like Sine wrong.
It sounds nice, but it's hard to prove a return on investment.
When the drug began large-scale trials in 1997, Novartis knew that it might be hard to prove the drug was truly effective.
That is presumably because the wretches knew their own seats were safe, but it makes it hard to prove the map was partisan.
Disgruntled investors will find it hard to prove that the new system has broken these contracts, says Lianne Craig of Hausfeld, a law firm.
Such stealth discrimination is hard to prove: buyers' agents can always say they ignored a listing because it did not meet their client's needs.
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This is possible, but hard to prove or disprove, Brent said.
It would be very hard to prove that any information leaked or gleaned about a film before it is released could rise to the level of insider trading.
Although he admits that it is hard to prove, he believes there is a correlation between a country's economic performance and the combined sales growth of its multinationals.
As a World Cup winner in 1999, Burke arrived on Tyneside with a massive reputation, and says he worked extra hard to prove he was here for sporting rather than financial reasons.
The charge of overspending will be hard to prove or disprove: the state electoral institute cannot demand the parties' accounts until two months after polling day, and they need not produce receipts.
On top of this, in particular cases it would it would be hard to prove the chain of command leading to Colonel Karuna personally in an organisation as secretive as the Tigers.
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