Your limited to a certain number of questions you can answer a day?
yes it's made to prevent spam
Yes. Don't know the number though.
If your talking about ask.com no your not
Yes you are limited and I always hit this cap, before you had a cap per hour that would limit your amount of replies, now it is daily and I always get hit with it.. you then have to wait 12 hours before replying to more questions
I don't think there is one.