Chatroulette is an online webcam chat site that randomly pairs strangers for conversations. Chatroulette has very few rules -- in fact, they only have four. However, Chatroulette is very serious about enforcing these rules, and getting caught violating them can lead to having your IP banned from the site.
Nudity or Suggestive Content
Chatroulette's first and foremost rule is that nudity or suggestive content is not permitted. Specifically, you can have your IP banned not only for exhibiting nudity or suggestive behavior, but also for suggesting or requesting such behavior. TechCrunch notes that Chatroulette's strong stance stems from the site's infamous reputation for attracting exhibitionists, a problem Chatroulette continues to police.
Your IP may also be banned if you are using Chatroulette while under the age of 18. Chatroulette's rules state clearly that the service is for ages 18 and older. A first offense may not constitute an IP ban, but repeated violations may result in one. If you are under 18, Chatroulette is not for you.
Using the Chatroulette system to spam is also an offense that may constitute a ban. Utilizing the random chat streams to advertise for products and services, or to attempt to scam other users, is strictly prohibited. If you are looking to advertise, there are other methods that are not only more likely to produce results, but also likely won't result in a ban.
You can also have your IP banned if you use false video streams or webcam feeds. In this case, "false" means a stream or feed that is not from your own webcam. If you've somehow connected another person's stream to Chatroulette as your own as a means of deception, your IP can and likely will be banned for the offense.