1) How often do you use/visit TV Tropes? Do you edit it, or simply read it?Only read, probably initially ever few months (when someone links to something I haven't seen before), but then I build up a "portfolio" of tabs in the browser with further linked-to items (mostly a problem when I find myself stumbling over anything Discworld-related, especially, given the diaspora of links you can get from that starting point alone) which I work through until I decide it's got beyond a joke or I'm forced to reset the machine I'm on. (Other tabs might get bookmarked, for reinvestigation shortly after, but I know I'll come across TVTropes again, so won't bother to do that with this.)
I've been tempted to edit, but it seems like there's a viable enough community and I can only add minute quantities of new matter, so as yet I've refrained. (Consider it an extended lurk, so that when I finally do post I'm already aware of the conventions.
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2) How useful and/or interesting do you find the site? Which parts do you find the most useful/interesting?Usefulness, probably low. Although I've used it to identify similar things and themes to those items from the real-world I already found interesting.
Interestingness, well, it's always nice to see new takes on something (or indeed an initial take on something I may have not considered). Usual wiki-wise pinches of salt are always taken with opinions, of course.
3) What criticisms do you have toward the wiki? What criticisms have you heard from others?The usual wiki-effects apply. Whether that's a criticism is itself subjective.
Last time I went to the site, however I noticed (and it might have been around for a while) I noticed a set of sub-page icons. I tend to avoid icons that are "Facebook like/follow", "Retweet", "Linkedin", or similarly related, so I'd been ignoring them, until I realised that these "Moments" icons weren't aanything like that, and that there were (perhaps interesting, perhaps not) additional aspects to the page, on top of the YMMV and quotes links which I all too often forget about normally anyway...
Not sure what I'd do about that, though. Compare to the fact that I remember imdb.com before it
was imdb.com (in its first-flush-of-the-web Cardiff era, not ever really using the r.a.m version), and it used (even a number of years after Amazon purchased and remodelled it) to have an intuitive way of getting to quotes, frexample. But now it doesn't. Stay away from those kinds of changes, if that makes any sense.