How do you determine the credible Internet news stories from the ones that are simply rumors? Ciara Byrne, writing for Fast Company’s Co.LABS, highlights how startup Storyful verifies social media content for news organization. In addition, Ms. Byrne provides 12 web-based tools “to help you do some fact checking of your own.” Here are some of those tools:

Politifact: Fact checking for U.S. politics

Geofedia: Social media search and monitoring by location

Google Maps and Street view: Use to compare a video or photo with the location where it was purportedly taken

DomainTools: Check domain ownership