The box is for happy thoughts. Most people find sex a pretty pleasant topic, even if occasionally juvenile.
We filter out hateful or racist things. (I.e. those aren't happy things.) We also filter out the random letters, though I like to leave in the JavaScript injection attempts.
Jon writes on behalf of himself for techcrunch. As I'm sure you realize, we aren't interested in "locking things down".
We are always looking for good people, as is everyone else. The level of skills and capabilities out there is much lower than the demand, and given how much money is involved it is pretty surprising that we aren't, as a society, as the globalized interconnected species we are, training more people to develop the skills. Especially when the tools are so in reach and you don't need formalized training or get licensed or whatever.
We hire between 2-4 people a month, whenever we find a good fit. We are especially looking for team leads and technical project managers, but if you are good then we find a way to make it work. Engineers who can communicate and lead are the limiting resource.
And if you don't think that "jiggly breasts" qualifies as a "happy thought" on a corporate homepage then it's probably not a good match...