Facebook's Mark Zuckerberg understands the need to stamp out hate speech on the world's biggest social network, German Chancellor Angela Merkel's chief of staff said on Thursday after a meeting between the two in Berlin.Zuckerberg is on a charm offensive in Germany, where the company he co-founded has faced criticism for months from politicians and regulators over its privacy practices and a slow response to anti-immigrant postings by neo-Nazi sympathizers."We in Germany obviously want illegal content to be removed from the Internet. That concerns not only Facebook, but Facebook among others," Peter Altmaier said after a meeting in Berlin with Zuckerberg."My impression is that Mr. Zuckerberg understood the importance of this issue," he said, describing the meeting as "very good and constructive."Facebook's rules forbid bullying, harassment and threatening language, but critics say it does not enforce them properly. It has hired a Bertelsmann business services unit to monitor and delete racist posts on its platform in Germany.