Star ratings rather than written reviews have been available to readers for some time and are likely mostly taken up by goodreads' members. It seems to be the trend over there from what I saw recently on a new release of mine. I had something like 10 ratings and no reviews as such, 3 of which seem to have been posted on Amazon, but I can't prove this as there is no reader attached to the ratings on Amazon.
Not seen the "also liked" but I'll go take a look.
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