High opioid - receptor availability may, however, protect against excessive distress resulting from negative social signals, such as other people's distress. (sciencedaily.com)
Instead, it's most commonly used for social signaling and to regulate their body temperature. (geekwrapped.com)
The search engines are looking at social signals to help them find the meat in the vast sea of content that is being produced. (businessinsider.com)