You can now easily share reviews from multiple locations on IMDb using the share menu. Here's how:
Look for the vertical three dot menu in the bottom right corner of any review, and click/tap to open the menu - where you can select from available share options:
Note: When sharing a review from a title page or the title reviews subpage, the shared link will take people to the title reviews subpage where the shared review will be highlighted at the top of the page, like this: