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That is a reasonable point, whatever you post in a foreign language section is basically unmoderated. Nevertheless, I think I also have a valid point which is don't these guys want the advertising there? Also, couldn't the campaign manager communicate with the moderator of that subforum if someone was making rubbish posts. I imagine that one of the conditions of being a subforum moderator would be the ability to communicate in English.
Lets assume for a second that a manager is looking for constructive posters instead of constructive posts (see my earlier post[1]). In that case the manager of said campaign could hire someone trustworthy that understand the language spoken in the local section. This person could judge the overal quality of the posts of someone applying and maybe reevaluate after some time. This would allow the managers to advertise in local sections and still maintain a reasonable quality of post(s/ers). I think certain section would certainly be worth the investment. E.g. if the site you are advertising for is also available in russian/chinese/thai it makes no sense to leave those markets out of the picture. Esp. China is huge in terms of bitcoin.
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Not only would the advertiser benefit but the system should, at least in theory, increase the average quality of posts across the board since it would provide an incentive for users to create higher quality posts.
I would argue not only does the board (or system) benefit, but its essential to keep signature campaigns an option for admins. I dont think a bot can do this currently either, but I think bitmixer.io is not high enough of the pay per post scale to make a big difference in spam. Esp. since it has no lower limit in posts its an excelent campaign for those that dont post much.
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Of course you're right that this is indeed beyond the scope of most signature ad campaigns but in fact we might have the technology to do this, given the work. Imagine you train a classifier on the posts of a thread and then measure the perplexity of a given post with respect to that thread, I wonder if you could find the right set of features such that this sort of framework could be a proxy for "constructiveness".
The question remains who defines what constructive is. As we can see with this thread, there is no easy answer. Anyone of us has a feeling for a posts constructiveness, but its hard to quantify. You cant say this post has 4/7 constructiveness. AI systems do not necessarily need to quantify things to judge them, but who should train such an AI? Maybe if we had 1 billion $ for the new board...
Ill just post this
there I guess
[1]
https://bitcointalksearch.org/topic/m.10789271