No, not anymore than you would be penalized each time someone started a thread with the same name. Google penalizes based on large blocks of duplicate content.
https://support.google.com/webmaster...er/66359?hl=en
Quote:
Duplicate content generally refers to substantive blocks of content within or across domains that either completely match other content or are appreciably similar. Mostly, this is not deceptive in origin. Examples of non-malicious duplicate content could include:
- Discussion forums that can generate both regular and stripped-down pages targeted at mobile devices
- Store items shown or linked via multiple distinct URLs
- Printer-only versions of web pages
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And those actually would be large blocks of duplicate content, but Google makes a distinction between those and malicious content. In short, you'd kinda have to go out of your way to raise flags in that respect.