Today I came across this post that was, basically, asking for a library.
It was closed and OP wanted to know why, so I posted in the comments explaining that questions asking for Libraries aren't really the best type for StackOverflow, hence being close-voted.
However, follow-up comments from OP seem to suggest that he couldn't find anything in the FAQ regarding questions about libraries. Searching the FAQ for "library" or "libraries" yields 0 results.
Basically, can we have clearer information in the StackOverflow FAQ regarding questions for libraries? I feel a little sorry for people like OP who feel (legitimately) that their question could be useful for future visitors but have had it closed because of the voting system options.
I'd like to be able to point to somewhere specifically (and officially) in the FAQ that says the following:
Questions asking us to recommend a tool, library or favorite off-site resource are off-topic for Stack Overflow as they tend to attract opinionated answers and spam. Instead, describe the problem and what has been done so far to solve it.