Categorize the comment on the basis of obscenity. If the comment is obscene output Yes, otherwise output No.
One example: Will this remove the property from city taxes?
Solution is here: No
Explanation: The comment here is just a normal question without any indecent words and categorized as not obscene. Hence, it is a positive example

Now, solve this: I am unsure of where you are going with this, for all the years you camp out on this post you have shown to be a 150% supporter of all things ultra conservative. You once posted to me that the state of Alaska was in such great fiscal shape and it was all due to the fact that most governors were elected GOP and that we have a GOP led majority in the state legislator. Well, those posts to me were a long time ago, are you not happy that your conservative led Alaska government did not save the day?
Solution:
No