Copyright Legal Issues
You just can't republish contents that you don't own and claim it as your own. You cannot use images, videos, audio and other content without asking proper permission from the owner, if they've sent a go signal, go ahead and use the content with proper credits.
Spreading false statements, rumors and/or just wrong information even under anonymity, is a huge NO - NO. You'd get sued right away is you've messed with the wrong person/company.
I am a huge fan of self-promotion; I do do that too but let's just keep things moderate.