In a series of tweets, he said he was doing it "as a father who needs to be able to answer his black daughter when she asks: 'What did you do?'"
It follows days of US protests against police brutality and racial inequality.
Mr Ohanian, who is married to black tennis champion Serena Williams, said he would be donating $1m (£800,000) to Know Your Rights Camp, a non-profit started by former NFL quarterback Colin Kaepernick.
"I believe resignation can actually be an act of leadership from people in power right now," he said in a video. "To everyone fighting to fix our broken nation: do not stop."
Mr Ohanian founded social media website Reddit 15 years ago with his college roommates Aaron Swartz and Steve Huffman.
He stepped down from daily duties in 2018 but has retained a seat on the company's board until now.
Reddit promoted its first female board member, Porter Gale, last year.
But the website has come under fire for hosting forums that promote racist content. The company has banned groups like r/blackpeoplehate and alt-right r/MillionDollarExtreme. It has also "quarantined" a pro-Trump forum, r/TheDonald, ensuring that its content does not appear in website searches or recommendations.
Earlier this week, several popular Reddit forums switched their access rights to private, or banned new posts entirely, to protest against the company's hate speech policies. Ex-chief executive Ellen K Pao also lambasted her former employer in a tweet, saying: "You don't get to say [Black Lives Matter] when reddit nurtures and monetizes white supremacy and hate all day long."
Posts
Thank you for reaching out to us. We are happy to receive your opinion and request. If you need advert or sponsored post, We’re excited you’re considering advertising or sponsoring a post on our blog. Your support is what keeps us going. With the current trend, it’s very obvious content marketing is the way to go. Banner advertising and trying to get customers through Google Adwords may get you customers but it has been proven beyond doubt that Content Marketing has more lasting benefits.
We offer majorly two types of advertising:
1. Sponsored Posts: If you are really interested in publishing a sponsored post or a press release, video content, advertorial or any other kind of sponsored post, then you are at the right place.
WHAT KIND OF SPONSORED POSTS DO WE ACCEPT?
Generally, a sponsored post can be any of the following:
Press release
Advertorial
Video content
Article
Interview
This kind of post is usually written to promote you or your business. However, we do prefer posts that naturally flow with the site’s general content. This means we can also promote artists, songs, cosmetic products and things that you love of all products or services.
DURATION & BONUSES
Every sponsored article will remain live on the site as long as this website exists. The duration is indefinite! Again, we will share your post on our social media channels and our email subscribers too will get to read your article. You’re exposing your article to our: Twitter followers, Facebook fans and other social networks.
We will also try as much as possible to optimize your post for search engines as well.
Submission of Materials : Sponsored post should be well written in English language and all materials must be delivered via electronic medium. All sponsored posts must be delivered via electronic version, either on disk or e-mail on Microsoft Word unless otherwise noted.
PRICING
The price largely depends on if you’re writing the content or we’re to do that. But if your are writing the content, it is $60 per article.
2. Banner Advertising: We also offer banner advertising in various sizes and of course, our prices are flexible. you may choose to for the weekly rate or simply buy your desired number of impressions.
Technical Details And Pricing
Banner Size 300 X 250 pixels : Appears on the home page and below all pages on the site.
Banner Size 728 X 90 pixels: Appears on the top right Corner of the homepage and all pages on the site.
Large rectangle Banner Size (336x280) : Appears on the home page and below all pages on the site.
Small square (200x200) : Appears on the right side of the home page and all pages on the site.
Half page (300x600) : Appears on the right side of the home page and all pages on the site.
Portrait (300x1050) : Appears on the right side of the home page and all pages on the site.
Billboard (970x250) : Appears on the home page.
Submission of Materials : Banner ads can be in jpeg, jpg and gif format. All materials must be deliverd via electronic medium. All ads must be delivered via electronic version, either on disk or e-mail in the ordered pixel dimensions unless otherwise noted.
For advertising offers, send an email with your name,company, website, country and advert or sponsored post you want to appear on our website to omodjk(at)gmail(dot)com
Normally, we should respond within 48 hours.