formal and logical reasoning whereas a lower value indicates focus on narratives. Also, cognitive processing measures problem solving in mind. Words such as “think,” “realize,” and “know” indicates the degree of “certainty” in communications. Critical thinking ability relates to education [@berger1984clinical], and is impacted by different stages of cognitive development at different ages [^23]. It has been shown that older people communicate with greater cognitive complexity while comprehending nuances and subtle differences [@chung2007psychological]. We observe a similar pattern in our data (Table \[Anova\].) A recent study highlights how depression affects brain and thinking at molecular level using a rat model [@calabrese2017chronic]. Depression can promote cognitive dysfunction including difficulty in concentrating and making decisions. We observed a notable differences in the ability to think analytically in depressed and control users in different age groups (see Figure \[LIWC-age\]- A, F and Table \[Anova\]). Overall, vulnerable younger users are not logical thinkers based on their relative analytical score and cognitive processing ability.

**Authenticity:** Authenticity measures the degree of honesty. Authenticity is often assessed by measuring present tense verbs, 1st person singular pronouns (I, me, my), and by examining the linguistic manifestations of false stories [@newman2003lying]. Liars use fewer self-references and fewer complex words. 