I prefer not to use it, since I think we are mostly adults here. I had to start using it because mods advised me to report after I received several warnings for responding to flamers and stalkers. Apparently the ones who flamed me also reported me for responding and since I did not report them for flaming and mods do not read beyond the reported post, I was considered the offender.
Since I did not know who would report me for what [as there is no clear cut rule for what is offensive] I began to report people in a manner consistent with previous warnings
After a few days, I received a warning for reporting. Since I would get warned regardless of the fact that I reported or responded, I quit reporting.
Didn't seem to be any point.
Overall I think I used the report button maybe ten times. Off and on I have reported some very slanderous posts directed against others, viz Lori and sandy but since they too seemed to receive no follow up, I quit that too.
So maybe between 10 and 20?