Cats have been shown to have their own individual personalities. Their types of body language, including position of ears and tail, relaxation of whole body, and kneading of paws, are all indicators of mood. The tail and ears are particularly important social signal in cats, with a raised tail acting as a friendly greeting. Tail raising also indicates the cat’s position in the group’s social heirarchy,  with dominant individuals raising their tails less often than subordinate animals. Nose-touching is also a common greeting and may be followed by social grooming,  which is solicited by one of the cats raising and tilting its head. Source: OneKind