I will provide a bounty of 1500 mana to anyone who posts proof of themself posting an advertisement for Manifold on a website/social media page/social media account/etc. that is primarily dedicated to (or heavily skewed towards) women in STEM - contingent on that advertisement not being taken down by the creator within 24 hours of it being posted.

This could include advertising to Reddit communities (such as r/LadiesofScience), posting in the #womeninSTEM tag on Twitter or other social media networks, posting on a women in STEM Facebook page, making a short Youtube video about the site and advertising it to women in STEM on Youtube, posting a link to Manifold in a women in STEM Discord server, etc.

Rationale

Manifold has an extremely skewed gender ratio at the moment: there are a few reasons why this is a problem specifically for a site like this. Namely:

• It can (in theory) foster a hostile or exclusionary culture. Thankfully, this doesn't seem to have happened on Manifold just yet - I've only faced outright misogyny on this site a few times in the roughly seven months I've been here.

• It means predictions - especially predictions about issues that primarily affect women - are going to be significantly less accurate than they could be otherwise. Scientific polls try to aim for a roughly even gender ratio for a good reason, and prediction markets would benefit from doing the same. As I said in the comments of another market, your predictions won't be as accurate as they could be if you're only sampling half the population.

I think Manifold needs to recruit more women in general, but why women in STEM in particular? They're more likely to be interested in what the site has to offer. I'm a woman in STEM, and if I wasn't in STEM, I probably wouldn't have ended up here - or if I did, I wouldn't have stayed nearly as long. Women in STEM will find more of the questions appealing and probably be interested in the statistical/game-theoretic side of the site as well. In addition, there are several organized communities of women in STEM on the internet, which makes it easier to advertise to them.

FWIW, that still leaves the site with a heavy bias of STEM people v. humanities people; but that bias is probably inevitable on a website this nerdy and scientifically-minded. Manifold is probably always going to attract more computer scientists and mathematicians that it will people in the humanities (though social scientists, particularly economists and political scientists, would probably thrive here too.)

Fine print

Since I don't want anyone cheating the system and getting a bounty by fulfilling the letter of the market but not the spirit of it, I have a few rules:

• You must provide proof of the advertisement in the form of a link to the post (or an embed of it,) so I can be sure it actually exists and isn't a shopped/edited screenshot.
  [EDIT]: A screenshot is acceptable proof if the advertisement was posted in a private group chat (or on a private Twitter, etc.) - you can censor/blur names and avatars if you'd like.

• The advertisement must be posted in a good-faith attempt to get people to join the site. You benefit from this - the more people sign up from your referral link, the more mana you get from Manifold itself! Your advertisement does not have to succeed - you can have zero sign-ups - but it should at least have a chance of success. Posting on a two-follower Twitter account without tagging the tweet doesn't count as a good-faith attempt, but adding a hashtag to it or posting on an account with hundreds of followers does. There needs to be an effort to make sure people see it.
  [EDIT]: "Good-faith attempt" also includes sending the advertisement to people over private messages/VoIP services like Discord, Slack, etc., so long as at least one person you're sending the message to is a woman who you expect might be interested in joining Manifold, who doesn't have an account yet.

• Related to the above: Do not take down/delete the advertisement for at least 24 hours after originally posting it. I don't want anyone to be able to post an advertisement, immediately delete it, and then claim a bounty. It needs to be up for long enough that people have a chance to see it. I will award the bounty after at least 24 hours have passed since the advertisement was posted. I'll try to be quick, but I can't promise it will be instantaneous. I can promise a wait of less than 48 hours.

• If an advertisement is removed or taken down by someone other than yourself (e.g. by moderators of a subreddit/other social media page - please provide proof if you can), then I'll still give you 100 mana for posting it and 10 more mana for every hour it was up (rounded down,) to a maximum of 230 mana for an advertisement that was up for 23 hours before moderators took it down.

• Related to the above: please do not knowingly advertise the site in any spaces that disallow advertising of websites. You might get in trouble and it might turn people away from Manifold if the people advertising it seem spammy or inconsiderate.

The advertisement can be aimed at groups that include women in STEM and other groups, or groups that are subgroups of women in STEM, so long as those groups are also at least mostly women - e.g. advertisements to "women in grad school" or "women in computer science" count. Advertisements to "people in grad school" or "students in STEM" etc. don't count - this site already has a large number of men in STEM, and most STEM spaces are also primarily composed of men.

The text of the advertisement doesn't matter, but there should be a link to Manifold along with a sentence or two advertising the site. I won't count it as an "advertisement" if the test makes the website sound bad, but I don't expect anyone to post an "advertisement" like that in the first place.

I won't be looking through new accounts who join because of the advertisements to see if they're actually women or not. I don't have time for it, nor do I really care; it's the intention to get more women to join the site that matters to me.

I may add more bounty to this market in chunks of 1500 as needed. It's a large bounty and my liquidity is somewhat limited, but hopefully I shouldn't run into any issues. If I do, I'll post a "bounty queue" at the top of this description, stating when future bounties will be paid out.

You can submit as many posts as you want to, and each are eligible for the bounty, but you must post a different link in each post. They should be from different sites or different communities within the same site; posting three tweets in a row with a link to Manifold and "#womeninSTEM" in the tags earns you 1500 mana, not 4500, but advertising to both r/LadiesofStem and r/TwoXChromosomes earns you 3000 mana. Submitting multiple links in a single post does earn you more mana, so you can submit one comment with three different advertisements instead of three comments with one different advertisement each, if you want to. Posts can be in the same site/same community if at least one month has passed since the previous one was posted.

There's no closing date to this bounty market - it stays open for the indefinite future.

Disclaimer

I am not doing this on the behalf of Manifold's admins or any of Manifold's employees; nor am I being paid or receiving other benefits for advertising the site. This is a community effort to try to recruit more women to the site. I am not responsible for the contents of any advertisements that are posted by users seeking a bounty from this question, nor am I responsible for the behavior of any users who join the site because of these advertisements.

I may, at some point, also post some advertisements of the site; if I do, I obviously cannot award myself a bounty for doing so (nor would I wish to.)