What's the goal of this site? I'm not sure I'd want to ask someone a question that they may have already read the answer to. When I interview someone, I want to know what they actually know or can figure out with hints, not whether they have Googled for the right list of questions.
Edit: oh, even worse, it tags them by the company that asks the question. Great. I'm sure those companies will appreciate having to come up with brand new questions for each candidate. And candidates will really be better off getting in based on memorized answers, then finding themselves unable to solve the actual problems in the job. (sarcasm)
Wouldn't hitting Google be the sensible option to answer a question that you are pretty sure that other developers are likely to have encountered before?
So you might as well test how well people can Google rather than solving a problem by themselves... :-)
It's pretty easy to tell when a candidate has the answer memorized, and it is pretty easy to push them to explain their answer beyond what sites like this give. If they can't tell you things about how their answer would scale, what the tradeoffs are, why they used data structures they did, and what they'd do with slight modifications to the question, they probably won't just skate through the interview.
Edit: oh, even worse, it tags them by the company that asks the question. Great. I'm sure those companies will appreciate having to come up with brand new questions for each candidate. And candidates will really be better off getting in based on memorized answers, then finding themselves unable to solve the actual problems in the job. (sarcasm)