A Brief History of Uber's ControversiesIt's not just one scandal, it's a long string of them.

Silicon Valley'smost valuable startupcould also be its most toxic. Ascoop from BuzzFeedilluminated as much last night. At a private dinner, Emil Michael, Uber's SVP of business, suggested a plan to spend $1 million on a revenge campaign against journalists, in particular Sarah Lacy, a writer who hascriticizedthe ridesharing startup. Michael's apparent plan involves using data, which the company has access to through its app, to dig up information about Lacy's personal life, then publicly distribute the compromising information. He also talked about hiring opposition researchers to dig up more dirt.

The news quickly ricocheted around Twitter. Taken on its own, the story may not have stirred up such a fierce reaction. But the sheer volume of Uber scandals is difficult to ignore. With each new one, Uber's three constituents – customers, investors and drivers – are questioning the $18.2 billion company. (Kalanickissued an apologytoday on Twitter.) Below, a look at what got us here:

Drivers behaving badly

An Uber driver has been accused ofkidnapping a female rider.

An Uber driver was accused ofattacking a riderin the head with a hammer.

An Uber driverassaulteda rider. Another Uber driver, whopassed Uber's background check,assaulted and abused a rider.

An Uber driver hit andkilled a six-year-old girl. The company avoided liability because its drivers are independent contractors rather than employees.

An Uber driver wasaccused of rape. Another was accused offondling a passenger.

Driver treatment

Uber driversin New YorkandSan Franciscohave held protests and strikes for better pay and treatment.

Uber has been accused ofpushing its driversintosubprime auto loans.

Sexist comments

CEO Travis Kalanick joked about how desirable he is to women, thanks to Uber's success. "We call that Boob-er," he told a reporter.

Sexist ads

Uber promoted its services in France bypairing riders with "hot chick" driversand asking, "Who said women don't know how to drive?"

Playing dirty against competitors

Kalanick has repeatedly trash-talked rival Lyft, at one pointcalling the service a cloneon Twitter. Uber's elaborateplans to sabotage Lyftinclude aggressively recruiting Lyft's drivers and cancelling rides on the service to waste the drivers' time.

Uber has even tried tokneecap Lyft's fundraising(whichFortune's Dan Primack hasargued is fairgame; venture investorFred Wilson disagrees).

Playing dirty with the media

Uber tried toplant a fake storythat painted a positive picture of life as an Uber driver in LA Weekly after the publication ran acritical story.

Surge pricing during emergencies

Uber's famous free-market pricing strategy did not make an exception for Hurricane Sandy, when many New Yorkers were displaced and the cost of taking an Uber car doubled. After complaints, the company said it wouldcap surge-pricing in emergencies.

Regulatory fights and protests

Uber tussles with the legacy black car and taxi industry in almost every city it enters. Many cities have tried to outlaw the service. When Berlin banned Uber, the company flouted the government andcontinued to operate. In other instances, Uber's presence that causes the commotions. In France, a protest of Ubergot physical当一个超级汽车的窗户被broken and its tires slashed. In London, a proteststopped traffic.

Now, Uber can't even release anintegration with Spotifywithout writers pointing out that the partnership "furthers the ongoing logistical process ofdehumanizing Uber drivers." That was supposed to be a fluffy product announcement. But seen through the lens of Uber's toxic history, nothing is.