Q4: How do I prevent spam?

Several techniques help prevent spam on WWWBoard:

1. Banned words filter:

   @banned_words = ("viagra", "casino", "cheap");

2. Block IPs:

   @blocked_ips = ("123.45.67.89");

3. Require fields: Make email required and validate format
4. Rate limiting: Limit posts per IP per hour
5. Simple CAPTCHA: Add a math question