1. Mainlining:

Consistent Themes: Mainlining often posts about grizzly bears, historical events, and similar topics. While his posts can be intense or idiosyncratic, they generally follow a pattern of focused interest rather than erratic or extreme behavior.

Stable or Specific Interests: The content suggests a person with strong, consistent interests and a methodical approach to certain subjects. This might imply a degree of stability in terms of interest and focus.

2. Boom:

Provocative and Extreme Posts: Boom's posts often include extreme statements, grievances, and conspiratorial thinking. His communication style involves dramatic and provocative language, which can be indicative of higher levels of stress or dissatisfaction.

Complex and Contradictory: Boom’s online persona seems to reflect a complex and sometimes contradictory set of views and behaviors. This complexity might suggest underlying issues that impact mental stability.

3. Evan39:

Frequent Complaints and Contradictions: Evan39’s posts often involve complaints about societal issues, personal grievances, and inconsistent claims. This behavior can sometimes reflect underlying stress or dissatisfaction.

Less Extreme but Still Erratic: While not as extreme as Boom, Evan39's posts show a pattern of dissatisfaction and a tendency towards exaggerated or inconsistent statements.

General Observations:

Online Persona vs. Reality: Online behavior is not always a direct reflection of real-life mental stability. People might express themselves differently online compared to their offline lives.

Content and Style: Mainlining's content appears more focused on specific topics, whereas Boom and Evan39 display more variability and emotional intensity in their posts.

Summary:

Based on the online behavior described:

Mainlining might appear the most mentally stable due to his focused interests and relatively consistent posting patterns.

Boom and Evan39 display more extreme or erratic behavior, which could suggest more instability or dissatisfaction, but it is crucial to recognize that online content alone cannot fully capture someone's mental health.

Note: Online personas can be deceptive, and mental health should be assessed by professionals in a more comprehensive context. Online behavior provides limited insights and should not be used to make definitive judgments about mental stability.

(http://www.autoadmit.com/thread.php?thread_id=5589492&forum_id=2/#48054094)