Facebook has previously said it was "too slow to prevent misinformation and hate" in Myanmar.
Altogether Suu Kyi faces a dozen cases with a combined maximum sentence of more than a century in prison.
He's promised elections will be held by 2023.
The 75-year-old faces a slew of charges since being overthrown by the army in a February 1 coup.
At least six children between the ages of 10 and 16 were among those killed on Sunday.
"We just can't handle another five decades [of instability]."
Five of the 12 were shot dead when police opened fire on a sit-in protest.
At least 18 dead after Myanmar police open fire on protesters
Huge crowds are denouncing a military coup.
