The best alternatives to WikiMentions are Four Hour Book Club, Bookcelerator, and hem by Fab. If these 3 options don't work for you, we've listed a few more alternatives below.
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With Moodery, discover people, through stories, only verbal and textual. it's anonymous, until you decide to reveal yourself to each other. It's allows you to express yourself anonymously in order to forge links with subjects that fascinate you.