Fantastic idea!!!!!! Have joined, I will be looking out for lost cats in the Campbelltown area, South-West Sydney. Another good idea is to register your animals with the National pet register, its FREE!

heres their website
https://www.petregister.com.au/You register your pets details, vet clinic and photo. They send you out a tag to put on your animals collar, similar to the old council tags.
Every pet has a number that relates to their info on the database, if your pet is found by someone they can call the number on the tag, which is is open to calls 24hrs a day, 7 days a week, 365 days a year. They quote the number on the tag and Pet register can then get in contact with you. All my animals are registered, as well as being microchipped.