Once you've looked through the pdf, please comment below - anything you found surprising? anything you think should be a catalyst for future research?
I am thoroughly impressed. I sort of thought there would be other sources of data (other forums, IRL, etc.), but the whole thing focused on us. It read more like an analysis of our community than an analysis of drug use trends. I like the idea of getting recognition of being a good forum, with smart members, and mention in a publication, but sort of feel 'objectified' in a way; being "dissected to see how we tick". That's seems kind of irrelevant though, the analysis rings true with what I feel is the essence of the site and the mentality of the majority of its members.
As for future research; maybe they should get off the opiate addiction track. Sure it's an important topic, but one that's been investigated and the mechanisms are generally well known.
My background tells me to ask for the track to shift towards psychedelics and the positive and negative effects they have had on users; even with infrequent use. Psychedelics aren't really a matter of public health as their level of use pales in comparison with other, more addictive classes.
With that understanding I would push for a shift towards investigating the effects of the numerous new (and not so new), research chemical stimulants being put on the market. The level of their use is relatively high compared to psychedelics, but unlike opiates their mechanisms of action and metabolism are not very well understood. A mapping of effects reported from users of these new drugs can guide investigation into a mechanism of action and give insight into its safety profile.
Gotta bring out the big guy

, Shulgin had to find out if his materials were safe or not by consuming them himself before passing them off to others. If we can integrate effects reported from many users, we might be able to see a trend that might not otherwise be seen in a single individual. This type of information could result in cessation of consumption of an unacceptably toxic research chemical before effects are seen in other users.
It would be a very good representation and practice of harm reduction.