Make sure that all wires supplying power are in good condition and connected securely, I think you may have just pushed it too far under some sort of OC/bad environment conditions.

Come on!
This isn't even close to a professional job, just another pump 'n dump.
Another shitcoin, stealing another name from the board.
Y U DO DIS @OP?

The higher the fee that you set, the faster that the transaction will be confirmed!
Transaction fee goes to miners in a generated block who confirm every and all transactions that the network gives your pool, the higher your fee, the faster the network fits your transaction into a block and releases it.

Divide your Kh/s by 10 and set that as your difficulty. Works just fine for me. Difficulty is always relevant.

Nope, nope, nopety nope.
I smell a scam. A big scam, a scam like pretty much every other.
Fake hype put behind it, impossible goals they've set have magically been reached almost immediately after their announcements... It's a great big bottle of lies made to steal money from investors. Don't even look at it too long, they have ads, that too is revenue for these dogs.

It will destroy American bitcoin use if they try and monopolize/regulate it.
Bitcoin isn't just American, if the U.S. tries to regulate it, they might just have adverse effects on bitcoin's ease of use and possibly price.

Well, this is advertising spam. Great.
Not to mention that other exchanges do exactly the same thing.

Ah, that's a shame, the pool could've done a world of good for Namecoin if they just left it as it was.

So I got a Antminer U3 and have been toying around with it.
Sure it doesn't make any ROI, but now for the question! What mining difficulty should I set it to? (Slush's pool)
I have it (currently) at 64, I've tried 512 and 256, but the hash rate on the dashboard/monitor has jumped very erratically.

Thanks for any input!

-Griffeh

I've tried it on my Samsung A-III, it works at about (at least that it registers when shares are accepted) ~1.5KH/s.
To be honest it isn't worth it at all, you don't see your hash-rate and most pools won't even pick up your speed.
The payed for option has a hash-rate monitor and the like, but I haven't tried it and it doesn't seem to function for Google Nexus tablets and phones. (Reviews complain about it quite a bit) So I didn't buy it.
Honestly, just use an old computer, a really old computer and get a better hash-rate.

GPU mining is relatively easy.
Google Scrypt-GUIminer.
Here is a link to the download; https://guiminer.org/guiminer-scrypt.html
Virustotal if you don't trust the link;
Link: https://www.virustotal.com/en/url/1cfd7127229aac6f15c40a2e2fae760b60abae5f04467cc757f01bf5a6cd99b4/analysis/ (0/63)
File: https://www.virustotal.com/en/file/aa6f0b036cb71686d12a83d5196f8c6b75f088bfaa46bb1dcb78204264feb385/analysis/ (36/56, analysed as PUP, but not a trojan. ) Most miners show up as types of PUP.
Also, if you're tech savvy, CGminer 3.7.2 allows GPU + Scrypt mining usage:
http://ck.kolivas.org/apps/cgminer/
I'm sure you know that CGminer is safe, this is the main directory for it 

Some guys were trying to mine bitcoin by hand?
Below:
https://www.reddit.com/r/Bitcoin/comments/1r3wau/mining_bitcoin_by_hand/
You can apply whatever hash-cracking power method that they used to decode this ominous message, I honestly don't know the start of mining manually, but you might want to try whatever method these guys used before it became unprofitable to crack the hash.

If you're fed up with low earning, either go to a real job and flip burger patties for $8 an hour and buy bitcoin or drop a 2K USD bomb and buy an Antminer S7, earnings for days, I say.

Hah "Hacked"
Pretty sure the buggers pulled a Mt Gox and ran away with the $1.8 mil.
Who wouldn't want to bugger off with (nearly) two million USD worth of bitcoin?
Sure, morales and the like, that wasn't their money to run away with.
Not to mention that it wasn't even a hack, it was social engineering that burned them to the ground.
Anyway, if it is genuine, isn't there a way to track where all these millions are heading? It's bitcoin, shouldn't the company know their transaction IDS etc?

Huh, thanks for this, was thinking of creating a rig and I had absolutely no idea how to do it. This helps alot, thanks guys!
Off to get more research!

Card is too old, no software is available for it to mine.
Plus, what are you going to mine with a 260?
I've tried everything on my 220...
Coded my own software too, unfortunately, it's garbage.
Buy a 750 Ti, cheap and being sold by other miners that have updated to AMD cards/Sapphires.

Someone payed localbitcoin to give them a list of their registered emails.
I know somebody who was crapping on another site for doing the same thing, outside of the bitcoin circle. Companies are just that, companies. Made to make profit, the human condition, wanting wealth in any form. Selling your email address = quick profit.

You can change the fee, the more money you so set as a fee, the faster the transaction will appear in a block.
You basically, small fee = slower confirmation, big fee = faster confirmation. No fee = no chance to be confirmed.

There is no option to set a NMC wallet address on slush's pool, so I'm just going to assume that they are pocketing it from the miners.

Bitcoin IS being simplified for normal consumer use. People already use it at waffle stalls in my country (South Africa, I know! Crazy right?) and I buy waffles every weekend. I guess me and the waffle guys are used to working with the system of mobile QR codes and all that. Not to mention that bitcoin is so much easier to use than a year ago.