It is possible to track and image satellites, Meade goto telescopes for example can have ephemeris data loaded to allow tracking. Imaging of satellites is usually done with video, the individual frames are then stacked and processed to provide the best result. Regarding sharing of data it happens regularly on IIS, if you look back through past forum activity you will find images that are made from composite data i.e. from different sourcess.
http://www.heavens-above.com has predictions for satellites including iridium and ISS.