Most sightings are made when no one has a camera with them. Now that the majority of mobile phones have camera's build in more and more UFO photos are being taken. The problem with this is the quality of the pictures taken by some phone camera's is quite poor. Saying that, a lot of phone camera's now come with video capability allowing even more UFO sightings to be recorded.
The first head of Project Blue Book was Captain Edward J. Ruppelt who officially coined the term "Unidentified Flying Object." Ruppelt resigned from the air force and wrote the book The Report on Unidentified Flying Objects, in which he describes the study of UFOs by the USAF from 1947 to 1955.