We have all use the Quora website as some point. Normally an answer to most questions can be found there. Normally the results are quite accurate. The website has for quite a while had an ads program although a bit fiddly and hard to use, but they have changed this
In 2018 the quora site had around 300M users, what makes quora a really interesting position for advertisers is that apparently half of their users are allegedly in the demographic of earning in excess of $100k per year. I have not used the new interface yet but apparently recently the ads are getting better engagement than Linkedin.
There is also a new promoted answers ad option, where you can bid to have your answer to specific questions which sounds very interesting.