"post a challenge" is a correct and usable phrase in written English.
You can use it when you want to ask someone to create a challenge or competition that they would like other people to participate in. For example, you could say, "Let's post a challenge online and see how many people can complete it!".
"When leading electronics retailers dramatically cut the price of a tablet just to get it off the shelves, conventional wisdom and recent history suggests that device is likely failing to post a challenge to Apple Inc.'s iPad.
You can't just go to the site and post a challenge to get everyone to cover themselves in butter and slide down a roof.
For example, an NGO can post a challenge, calling for someone to design a cheap water filtration system with the winner receiving a prize of $10,000, or a job working with their project.
A nonprofit can simply post a challenge, get responses, choose what they like, then send a "Thank you" Award of Excellence.
Like the crises described in my previous post, a challenge of this magnitude requires coherent strategies and action across public, private and social sectors and a collective focus on advancing broad-based economic growth and inclusive development.
Quantitative real-time RT-PCR (qRT-PCR) revealed differential expressions of these miRNAs in 8 organs (gill, brain, eye, muscle, liver, intestine, heart and kidney) and in spleen of the Asian seabass before and post a challenge with lipopolysaccharide (LPS).
She posted a challenge on her blog for information about the immigrant Annie Moore.
Rather, he had attended the performance at the encouragement of alt-right personality Mike Cernovich, who posted a "challenge" on Periscope last week offering a $1,000 prize for anyone who could get tickets to the play and interrupt the show.
However, high sequence variability of the viral agents posts a challenge to the design of robust universal virus-specific primer sets to amplify various virus variants.
The broad clinical spectrum of migraine and the results from heritability studies have posted a challenge to the understanding of the underlying pathophysiology and molecular genetics.
In early 2011, Jervis posted a challenge to IdeaStorm, saying it would work a lot better if Dell joined the conversation rather than just watching.
