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MIAMI — A Miami felon nicknamed “Crazy Goat” got cuffed on a weapons rap after posting photos of himself loading guns.

Months later, online snapshots helped police pin charges against three teenagers on allegations of drug-fueled group sex with underage girls.

Then there was Karla Sanchez, who saw an overweight woman naked in the shower of a North Miami gym. She whipped out her smartphone, snapped a photo and immediately posted it. Her not-so-smart caption: “The things I see at LA Fitness. WTH!”

Within weeks, cops jailed Sanchez, 18, on a misdemeanor voyeurism charge.

Each of these recent cases stemmed from photos or video posted on Instagram, the fast-growing social-media site that has increasingly become a treasure trove of evidence for police and prosecutors.

Several weeks ago, Miami-Dade detectives sent search warrants to Instagram’s corporate office, hoping to obtain posts to seal convictions for two defendants awaiting trial — one of them for murder.

“We encourage the criminals to post their photos and videos online,” said Miami-Dade State Attorney Katherine Fernandez Rundle. “After all these years, they’re still kind enough to do it.”

Spilling the beans on social media has become so common that defense attorney David Seltzer, a former Miami-Dade cybercrimes prosecutor, now makes it a point to caution his clients.

“I think technology has made people relaxed and made people let their guard down,” Seltzer said. “First thing I tell clients is, ‘Turn off your social media. Why make the job of the police easier?’ ”

There have been a number of notable social-media crime cases, topped by Derick Medina of South Miami. In 2013, he shot his wife, and then uploaded a photo of her dead body and a confession to his Facebook page. Medina, who is awaiting trial, claims self-defense.

Now, Instagram is quietly fueling or aiding several police investigations in Miami-Dade.

Founded in 2010, Instagram has boomed, becoming so big that Facebook paid $1 billion to buy the company that an industry analyst recently valued at $35 billion. Last month, Facebook announced that 300 million people use Instagram each month. The site claims that an average of 55 million images are uploaded daily.

Instagram allows users to post photos with a variety of filters. A “selfie” might get a vintage sepia tone, or a mundane street scene could pop with dazzling colors that might resemble a paint-by-numbers canvas.

Alex Jordan, a Dartmouth University psychology professor who researches social-media habits, says Instagram helps people “advertise a heavily filtered and more-interesting-than-reality image of themselves and their lives.”

“Instagram can feed our narcissism, or at least reflect it,” Jordan said. “All it takes is a bit of overconfidence to lose sight of the legal and personal risks of posting potentially incriminating photos or other information online.”

That’s what happened to Sanchez, who posted the photo of the naked gym patron. Sanchez “thought it would be funny,” according to a police report. By chance, a relative of the woman saw the public post.

The woman in the locker room “had an expectation of privacy” and was “publicly humiliated,” North Miami police said. Last summer, Sanchez accepted probation and agreed to complete community service.

The yearning to show off, prosecutors say, snagged Bryan Yanes and two West Kendall teenagers. They’re accused of plying girls — ages 12, 13 and 14 — with drugs and booze at a party before having group sex.

Miami-Dade detectives learned that Yanes, 18, had posted salacious photos of the tryst to the Instagram account known as “loverboybryan.” Though Yanes’ Instagram account was set to “private,” detectives got the photos anyway, with a search warrant sent to the company’s California office.

The three are awaiting trial on charges of lewd and lascivious battery on children.

Even when an account is set to private, law enforcement can still find incriminating photos, said Bradley Shear, a Washington, D.C., lawyer who specializes in the emerging area of social-media law.

“You don’t know who is watching you,” Shear said. “You don’t know who your friends are.”

Instagram regularly monitors posts and complaints about unsavory photos or video clips. The company also maintains an “Instagram Law Enforcement Response Team” that fields subpoenas, court orders or search warrants signed by a judge.

An Instagram spokeswoman declined to say how often the company cooperates with law enforcement.

In an era of increased wariness over government digital spying, “it’s a positive development that the police are obtaining warrants to obtain access to these accounts,” Shear said. “This type of evidence is very strong, and it’s only going to increase with use in legal cases.”

Investigators suspected that Miami’s Bernardo Olvera, 28, was dealing cocaine. Their opportunity to enter his house came because of photos and video clips publicly posted by Olvera and his girlfriend under nicknames that included chivoloco, Spanish for “crazy goat.”

They depicted Olvera, a felon who can’t legally have guns, loading ammunition into weapons.

Armed with a search warrant, cops raided his West Miami-Dade house. They found marijuana and cocaine, according to an arrest report. He is awaiting trial on cocaine-trafficking and weapons charges.

At least one other Miami man is doing serious prison time, thanks to Instagram.

In November 2013, serial shoplifter Leroy Minnis stole $2,238 in merchandise from a store in South Miami.

To sell the hot shirts, Minnis posted photos of them on his Instagram account.

Another photo showed him, with a woman on each arm, wearing a distinct black T-shirt with gold lettering — the same one seen on store surveillance video.

He’s now serving a 32-month prison sentence.