Sheryl Sandberg, pivotal in Facebook's growth, exits Meta board.

Sandberg, in a Facebook post, won't seek reelection in May.

Ex-Facebook COO, she faced scrutiny for Meta missteps.

Left COO role in 2022, remained a board member for 12 years.

Sandberg trusts Meta's future under Mark Zuckerberg's leadership.

Confidently departs, emphasizing Meta's ongoing strength.

Sandberg stays on as an advisor despite board exit.

Launched girls' leadership program to combat gender inequities.

Program includes a middle-school curriculum and adult resources.

Lean In is part of Sandberg's family foundation with late husband.