Duchenne smiles and the perception of generosity and sociability in faces.

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Emotional expressivity as a signal of cooperation (2010, background): “Many studies have found that cooperative and altruistic individuals display higher levels of positive emotion than non-cooperators (Brown, Palameta & Moore, 2003; Mehu, Grammer & Dunbar, 2007; Mehu, Little & Dunbar, 2007).”
Naturalistic observations of smiling and laughter in human group interactions (2008, background): “…care (Ambrose, 1961), a greater leniency from judges after committing minor offences (Forgas et al., 1983; LaFrance & Hecht, 1995), monetary benefits (Tidd & Lockard, 1978; Brown & Moore, 2002), and positive social judgements (Otta et al., 1994; Bachorowski & Owren, 2001; Mehu et al., 2007).”