Cheyenne Antoine, 21, was arrested after the police discovered the photograph, which showed her wearing a belt later found alongside 18-year-old Brittney Gargol's body.
Police were able to poke holes in Antoine's story that the pair went to the Colonial Pub and Grill after reviewing security tape evidence that showed they were never at the bar.
Though Antonine said she didn't remember strangling Gargol, she did not deny that she killed her, according to CBC.
Cheyenne Antoine pleaded guilty to manslaughter
After sentencing Antoine, Judge Marilyn Gray told her, "Honor your friend by becoming a positive member of the community".
Cops say Antoine - drunk and stoned - freaked out and strangled her friend to death.
It was while trawling Facebook that they saw Antoine wearing the murder weapon in a selfie and she became a suspect. CBC reports that Antoine did not dispute killing Gargol, but said she could not remember strangling her.
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At first, Antoine lied to detectives, admitting she had been with Gargol earlier in the evening but had left the party to spend time with her uncle.
In a statement from Gargol's family after charges were laid last year, they said their "prayers have been answered" have a "difficult two-year period".
Antoine was charged with second-degree murder and was due for a preliminary hearing but instead pleaded guilty to a lesser charge of manslaughter in court Monday afternoon.
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As a component of her request, Antoine acknowledged duty regarding Gargol's death yet said she didn't recollect killing her.
She later apologised in a statement through her lawyer, said the BBC.
Ultimately, a tip led police to a witness, who said Antoine confessed to the killing that night.
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"I will never forgive myself". I'm really, really sorry. She "has issues...and because of those issues she is risky", the CBC reported. "It shouldn't have ever happened". She also played the part of concerned friend, asking Facebook if anyone had seen Gargol.