Twitter executives promised to improve their user policies after grief-stricken Zelda Williams was harassed online about her father's suicide earlier this week.

A day after she posted a beautiful letter on Tumblr to her late father, Robin Williams, Twitter trolls began spamming Zelda with "cruel and unnecessary comments."

Zelda pleaded with her Twitter followers to report terrorizing bullies, who were apparently sending the 25-year-old morbid photos. Those accounts were eventually suspended, prompting Twitter to reexamine its policies.

Del Harvey, Twitter's vice president of trust and safety, said in a statement released yesterday to media outlets, including The Washington Post, that going forward they would not permit abusive behavior like Zelda endured.

We have suspended a number of accounts related to this issue for violating our rules and we are in the process of evaluating how we can further improve our policies to better handle tragic situations like this one. This includes expanding our policies regarding self-harm and private information, and improving support for family members of deceased users.

The changes, however, as some critics point out, will not stop Twitter trolls from simply creating new accounts.

[image via AP]