Attacks Against Tor 

Last week, we learned that the NSA targets people who look for information about Tor. A few days later, the operator of a Tor exit node in Austria has been found guilty as an accomplice, because someone used his computer to transmit child porn. Even more recently, Tor has been named as a defendant in a revenge-porn suit in Texas because it provides web-porn operators with privacy.
Here's the EFF: "Seven Things You Should Know About Tor."