We’re thinking more about this now that our API is nearing.
In the meantime, note that you can block any member from following you or posting comments on your content (look for the Flag icon on the member’s page).AniMagus commented
I'd really love it if there was an option to make our profiles private, and each user could set what kind of privacy option would he/she use.. for example, the account could be visible for everyone; or only for the ones the member follows.
Great suggestions. Much if this is catered for in our Pro feature: Year in Review. For example: http://letterboxd.com/matthew/year/2014/
Bringing an all-time summary to the account would be a nice addition.
Seems like something that would make sense for someone to implement using our forthcoming API.