most (not all, some contributions are QTVR-only due to historical reasons)
many, but depends on photographer's choice of file upload (newer event = more likely to work) and your device's capabilities. You may experience slow playback, distorted images or unexpected browser quitting if there is only limited memory/GPU power available.
Ipanema Beach, Rio de Janeiro, Brazil. This is one of the most famous beaches in Rio. Why? Well: "Tall and tan and young and lovely, The girl from Ipanema goes walking ..." The famous song that is known all over the world came from here. Together with Copacabana Beach, it stays crowded all year around. Brazilians love to be outside, walking, jogging, riding bicycles, going to the beaches and meeting each other. Rio is normally a very sunny, hot and humid city, but on the Equinox day, the weather was very strange and different, like you can see on the panorama.
Equipment: Nikon Coolpix 4500, Fisheye Lens Adapter FC-E8, Handheld, 8 photos, portrait mode, fullframe fisheye2 mode, white balance manually preset, manual exposure = 1/250 f-7.7, ISO 100, stitched in Photovista 1.0.1, saved as jpeg, open in Photoshop CS, made some adjustments in color, contrast, sharpness, and added a black stripe to top and to bottom, saved as PSD and taken to Make Cubic 1.1.6. File size: 560kb tiled: 2x2, compression: 39% photo-jpeg, fast-start added, HQ enabled. For the FULLSCREEN movie infos are= movie box: 780 x 500 pixels, file size: 1.8 mb, tiled: 3x3, compression: 39% photo-jpeg, fast-start added, HQ enabled.