How about a "reader's forum pet peeve?" I like to peruse various book identification forums, both to keep my own identifying skills sharp and to get the inside line on books worth trying out. I figure any book that someone remembers and wants to track down years later is probably worth at least a look, right?
One of my pet peeves about these sites relates to the people posting looking for help. Most of them have at least a vague description of the book in the subject line. "Skilled Hunter Vs. Monster In The Arctic" is what I used for the subject line of one of my own queries, for example, with further plot details in the main post. Other people describe distinctive cover illustrations, which can be very useful for jogging people's memories. Some people don't remember much at all, but they tell what they do know. "Murder mystery from the 70's" is a heck of a lot better than nothing. Any detail in the subject line helps, if only because I know I can't identify and am not interested in a "Gothic Romance From The 50's," so I won't even bother to open that thread.
And then there are the legions of posts with the subject "Can't remember book" or "Help!" Completely useless. I can't get too upset because the majority of people who post aren't even close to being regulars, so they don't know the customs, and they might not go online much at all except for the occasional question about this or that. But still, it's annoying.
What really bugged me today, though, were the regulars posting to try and identify the books. Some sites have few readers and thus few replies. Some have a lot of readers and sometimes a whole lot of replies to any given request. Many of the replies are completely worthless. I'm not talking about replies to the effect of "Ooh, that sounds good, I hope someone IDs it!" or "I'm reminded of a completely different book that you might like" Those do nothing to answer the OP's question but they're perfectly innocuous and foster a sense of community on the site. I like that sort of thing, even when I'm excited because there are nine replies but it turns out none of them actually IDed the book.
What drives me nuts are the people who seem to have a pathological need to suggest possible answers, even when a single second's thought would indicate that, no, that can't possibly be what the OP is looking for. Longshot answers are one thing, because you never know if the OP is remembering some details wrong or conflating two or more books. So sure, many unlikely suggestions have their place and are worth a shot. But some of them latch onto a single detail and suggest something that is quite clearly not right, just to have an excuse to post. I'll make up some examples to avoid my admittedly childish and way too long rant conceivably identifying or upsetting anyone.
OP - "I'm looking for a hard science fiction story set on Pluto where at one point a horned alien catches on fire and dies."
#1 - "You're probably looking for The Lord Of The Rings. The Balrog has horns and is cloaked in fire."
#2 - "There's an old Disney cartoon where Pluto the dog tussles with a bull that has horns and is accidentally knocked into a fire."
#3 - "The movie 'Backdraft' is about firefighters and there are a lot of scenes with fire. You should check to see if there's a novelization." (*)
#4 - "Satan is often depicted as having horns. I think you're looking for 'Paradise Lost.' Or maybe Dante's 'Inferno.'"
OP - "I'm looking for a pornographic book I read back in the 70's, which had a lot of hookers working out of an old red schoolhouse. It was seriously explicit, man. Motherscrabblers scrabblin' everywhere, it was great."
#1 - "Anne of Green Gables wasn't pornographic, and she didn't live in a schoolhouse, but it does have a color and a building or building part right there in the title, so you might want to take a look."
# 2 - "Who else likes pie?"
#3 - "You know what else is green? Grass. There's a lot of grass in Middle Earth. I think you're looking The Silmarrillion or one of the other Tolken appendices. I'm pretty sure I remember a schoolhouse full of whores in there somewhere."
#4 - "Apple is my favorite kind of pie. What's yours?"
#5 - "I remember a picture book about a little red school-house. The teacher was a bear and the students were all sorts of animals. Search Amazon, I'm sure you'll find it."
#6 - "PIE!!!!!"
Okay, I probably need to step away from the computer now. Also, I want pie.
* - For those who might be curious, there apparently was a novelization of the movie "Backdraft." I'm less surprised by its existence than I am by the fact that it was written by some guy named Kirk Mitchell rather than Alan Dean Foster. I thought Foster was required by law to do all movie novelizations from 1978 well into the mid-90's. (**)
** - Just to clarify, neither the movie nor the novelization of "Backdraft" take place on Pluto or involve aliens. (***)
*** - In all honestly I have to admit that I haven't read the novelization, so I should change that to "To the best of my knowledge, the novelization of "Backdraft" does not take place on Pluto or involve aliens."