If you do only believe in stuff with verifiable sources, simply not reading or believing online available material without links to original research, you'll save yourself from around 95% of propaganda out there, including online hate spreaders on youtube, facebook and even the (more than just a few times appearing) journalist spreading government propaganda out there.
I'm aware that most of the readers here know this, but still it appears to me that a vast majority of readers in the internet do not have the "verify sources yourself" mentality yet. It'd be great it you educate your peers accordingly.