Distinguishing between a comment written by a human and one generated by a bot can sometimes be challenging, as bots are becoming increasingly sophisticated. However, there are several factors you can consider to help you determine whether a comment was likely written by a human or a bot:

1. Language and Coherence: Human-generated comments often have a natural flow, including emotions, anecdotes, and personal experiences. Bots might produce text that seems more formulaic, lacking the nuances of human communication.

2. Grammar and Spelling: While bots can produce grammatically correct text, they might struggle with certain uncommon phrases, idioms, or context-specific grammar. Excessive spelling or grammatical errors can be a sign of bot-generated content.

3. Response Time: Bots can reply almost instantly, whereas humans might take a bit more time to compose a response. If you notice extremely rapid replies consistently, it could indicate automation.

4. Contextual Understanding: Bots might have difficulty understanding and responding appropriately to nuanced or context-dependent comments. If a comment seems to miss the point or misunderstand the conversation, it might be bot-generated.

5. Repetitive Phrasing: Bots might reuse certain phrases or sentences across different comments. Look for patterns of repetition that could indicate automated content.

6. Unusual Links or Promotions: Bots might include links to unrelated or suspicious websites. Be cautious of comments that promote products, services, or links that don't seem relevant to the discussion.

7. Generic Content: Bots often generate content that's generic and lacks personalization. Human comments are more likely to contain personal stories, emotions, and unique perspectives.

8. Complexity and Depth: Human-generated comments can often delve into more complex discussions, while bot-generated content might stay at a surface level or provide generic responses.

9. Unusual Timing: If a comment is posted at an odd time (e.g., during the night when most people are asleep), it could be an indicator of automated activity.

10. Response to Specific Prompts: Bots are often trained to respond to specific prompts or keywords. If a comment seems to be overly focused on a particular keyword or topic, it might be bot-generated.

Remember that the line between human-generated and bot-generated content is becoming increasingly blurred, with more advanced AI systems capable of mimicking human communication. It's always good to exercise critical thinking and use multiple factors to make an informed judgment. If in doubt, you might also try engaging the commenter in more nuanced or unexpected conversation to see how they respond.