There are lots of groups at Facebook and Google+ where authors self-advertize, and book review bloggers who have a waiting list measured in months or years, or who are all-too-often "currently not accepting submissions".
Is there a niche for moderated groups or blogs catering for hopefully genuine reviews of ebooks by readers?
Obviously, a group or blog would need to have clear rules and guidelines and enforce them. Groups would be faced with quality control and style issues and would most likely require several moderators working in different time zones. Blogs would be more labour-intensive, as it's difficult to establish the real identity of the poster, and the owner rather than the reader would have to collect, edit and post the reviews on the readers' behalf.
Anyhow, if there is a niche for this kind of thing, then please go straight ahead. The best of luck to you!
• By Etienne de L'Amour ~ Google+