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Twitter spammers are getting smarter but they still make dumb mistakes. All of these accounts don't look suspicious at first glance.

It's in the details

• No bio is a tip off
• No website is another big tip off
• All followed in a row which is a little weird
• All have just a state name as their location
• Three of the accounts all have the same recent three tweets
• The top two tweets repeat words "restaurant steak" and "discounted concert tickets" twice. No people talk that way on Twitter. (humans try to save characters)
• Lastly all the accounts use the same short URL's. Just going to the + in bit.ly shows all the other accounts using that URL. Take a look at http://bit.ly/grGEgg+ (opens new window), anything look familiar in the conversations area?

Come on spam, I know you are learning but really? I give the people props for being more subtle but they still have a long way to go before fooling a real human.