Broadly speaking, the site was created to help people share snippets of text or code. We don't mind if you submit 100 pastes/hour, but anything excessive is frowned upon. This applies to bandwidth as well, please don't abuse this service, it's not your own personal file host!
Failure to follow these simple guidelines will result in your account being disabled/IP address banned. If you upload malware, it will probably automatically be flagged and forwarded to malware researchers.