Serena Williams' husband, Alexis Ohanian, just announced he's giving up his seat on Reddit's board ... and he says it's all in an effort to help the black community.
The 37-year-old -- who co-founded Reddit 15 years ago -- said in a powerful video statement Friday he's urging the company to now give his spot to a black candidate.
Ohanian also announced he's donating any future gains he obtains on his Reddit stock "to serve the black community" ... beginning with a $1 MILLION donation to Colin Kaepernick's Know Your Rights Camp.