A little above 5k [1]. I used to be quite active in Java, Android and Python department when I was still learning a lot on those topics. Now when I'm a bit more proficient in them I usually do not have motivation to answer questions, for they mostly don't seem interesting enough to be worth the hassle. Ironically, my "best" answer [2] is related to JavaScript & jQuery - something that I don't really use all that much.
Probably the biggest problem I find with SO is the speed-typing contest that many questions introduce if they are (1) relatively simple to answer (2) posted under popular tag. I admit I am "guilty" of using this to my advantage few times, but after a while it loses its appeal. For one, it doesn't really encourage posting comprehensive and well thought answer, as you are very likely to lose the "race" this way. Although posting a simple answer fast and iterating it through edits alleviates this issue somewhat, it still feels more like a trivia contest with speed limit rather than an attempt to teach someone a small but valuable lesson.
Probably the biggest problem I find with SO is the speed-typing contest that many questions introduce if they are (1) relatively simple to answer (2) posted under popular tag. I admit I am "guilty" of using this to my advantage few times, but after a while it loses its appeal. For one, it doesn't really encourage posting comprehensive and well thought answer, as you are very likely to lose the "race" this way. Although posting a simple answer fast and iterating it through edits alleviates this issue somewhat, it still feels more like a trivia contest with speed limit rather than an attempt to teach someone a small but valuable lesson.
[1] http://stackoverflow.com/users/434799/xion [2] http://stackoverflow.com/a/8277968/434799