Bing found the following results
Letter Boxed - The New York Times - The New York Times
Letterboxd • Social film discovery.
Welcome to Letterboxd • Letterboxd
Films • Letterboxd
Letterboxd - Wikipedia
Letterboxd on the App Store
Letterboxd - Apps on Google Play
Letterboxd Review | PCMag
Is Letterboxd Becoming a Blockbuster? - The New York Times
What Is Letterboxd? The Social Network for Film Lovers - MUO