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I once read about a black guy who would, when out and about, make it a point to stop by places which have cameras (ATMs, stores, etc.) periodically, just so he would have proof of being near those places. I'm sorry I don't remember where I read it, but it stuck with me.

I remember Patrice O'Neal had a bit about this.

https://youtu.be/0xVF7yCKWno?t=60

Social media posts have helped exonerated people in the past

https://www.washingtonpost.com/nation/2018/11/16/his-ex-accu...

Well, generally it couldn't hurt your defense case to have exculpatory evidence on a third party server which you don't have control of, whether it be Facebook, Google, cell tower records, etc.

Also please note that I did not day that not having social media updates is indicative of guilt in itself. Absence of evidence isn't evidence of a crime. Even if she was an obsessive social media user, maybe her phone died and she couldn't post that day.