The broad name for this category would be called "Film," as that category encompasses motion pictures, episodic film, video, and other visual art forms. It was invented at the very end of the 19th century, though those films lasted, generally speaking, less than 1 minute. The first films are said to have begun in 1900.
Regular Blogs
Goes over the history of movies, with articles about both stars, movies, screenwriters, and the making of movies, with posts about the 50 greatest romantic movies with a poll for readers to weigh in, a quick guide to western movies, and an overview of bombshells, including Jayne Mansfield, Marilyn Monroe, and May West.
http://blogs.amctv.com/movie-blog/movie-history/
Contains numerous posts about movie history, including drive-ins and types of movie theaters.
http://celebrationcinema.wordpress.com/tag/film-history/
Hannah Croft: Film History Blogs
Shares information and photographs of historic movies such as Citizen Kane, It Happened One Night, and The General.
http://crofthannahfilmhistory.blogspot.com