If you've had a nice ride than it makes sense to tip but no one should feel pressured out of obligation.

Just rate the guy extra well. Tip him with publicity so he gets more business.

For the past six or eight months, I've tipped every Uber driver. Not out of a sense of obligation though, but because he or she took great care of me.

Yikes. Hope I don't run into one of these when I graduate. :/

Didn't realize marijuana was such a big factor on the darkweb. Think of the all the missed taxes!! :(

If you look at the second chart in the article [1] you can see that marijuana is much cheaper online than on the street in the US. A lot of it is coming from legal states and California, where it's cheaper to produce. Street weed in most of the country is usually either grown locally or imported from Mexico, so online prices are often significantly better.

[1]: http://cdn.static-economist.com/sites/default/files/imagecac...