A trademark issue!

Someone keeps changing "black lives matter" to "all lives matter" on the walls at Facebook's headquarters, and CEO Mark Zuckerberg is fed up.

"Despite my clear communications at Q&A last week that this was unacceptable, and messages from several other leaders across the company, this has happened again," Zuckerberg wrote today on a private company Facebook page, according to Gizmodo, which has a copy of the post.
Zuckerberg is just the latest: "'Black lives matter' doesn't mean other lives don't," he wrote. "It's simply asking that the black community also achieves the justice they deserve."

Some group called the 'black community' owns the motto, OK, I can get that, it's is a kind of cultural theft.

So tell me, how do I get in contact with this 'black community'.  I suggest  'black community' and Zuckerberg go solve the Baltimore black on black killings.  Writing on walls ain't doing it.