The article from CIO.com helps to let us know more:
Anyone who has participated in the blogosphere in the past two months knows the troubling story of Kathy Sierra, a prominent blogger who was the victim of online threats that included violent sexual acts and murder (“Death threats force woman to suspend blog, cancel talk at O’Reilly conference”). When the harassment spread beyond her own blog to two others that were affiliated with other prominent bloggers, Sierra became so terrified that she canceled an upcoming speaking engagement and took a hiatus from blogging.
Read the full story here