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In relation to post positioning and its relation to getting merited (quality/interest aside), I did an in-depth study on merited posts analyzing features such as with/without image, with/without quotes, post number (position within thread), post date, time between posting and receiving merit and post length. You can see the whole study here:
Forum Merited Messages- Does size count?.
In terms of post position within the thread, 15% of merited posts are OPs (first post), being 40,21% awarded to posts within the first page of posts in a thread.
Surprisingly, 32,58% of merited posts are on mega threads, 40,31% if we count post position 201 onwards. Ann sections and Economy (The Wall Observer is the extreme case) are behind these cases. These sections conform their own ecosystems and follow patterns that only happen there.
(post number is post position within thread. This is a global overall view, which will vary if we focus on a specific forum section/subsection).
Aside from post position, images tend not to help (statistics and a few others a logical exceptions). Also 56,50% of the merited posts are merited within the first 24 hours, adding up to 76,97% within the first week after the post is published.
Post do not need to be too lengthy either, since 65,07% of merited posts contain less than 100 words, with an additional 18,41% between 100 and 200 words. Longer posts do seem to get more merits, but cases are fewer and have studies and information that require the post to be long.
Even with all the said above (which is really about the meta-structure of the post), it is the content that matters, and that is not statistically derivable.
Excellent data! That leads me to my next question, is it good to makes tons a post every day? Would posting 10 times a day increase the chances of getting merit? Low quality posts would make it lower, but let's assume each post is of the same high quality. Would more posts mean more merit? Or would members check my profile and see lots of posts per day, and that may come off as spam?
I believe that the idea should be to post less, but with much more thought and/or research in each post. The more post of this kind, the more chances (but you need to invest a lot more time). On the other hand, posting lots of crappy posts standout way too much on the posting history, and the history is what builds your character and is often checked before awarding merit.