Attempting to get her new business off the ground, Anna worked in public services by day and as a startup founder during every other minute she could spare. She was feeling isolated by the extreme schedule and neglectful of her friends and family — typical of startup life — when she learned of her sister’s suicide. It would be the Twitter message, accidentally ignored for a month, that would send Anna reeling. The note asked that they get together. “I miss you,” it read. Anna finally saw it just days after her sister’s death.