Authority

• Who wrote it?
• What are the author's credentials?
• Who sponsors the web page?

Audience

• Who is the target audience?
• What is the purpose of the page?
• Advocacy, news, opinion, scholarship...

Currency

• When was the information published?
• Has a more recent publication disputed these claims?

Objectivity

• Is there a bias?
• How can you tell?
• Are facts accurately cited?

Support

• Are sources cited?
• Are citations from well-known authorities?

Other Criteria

• How deeply is the topic covered?
• What other information do you need to round out your argument?
• Is the content (article, book, etc.) easily available? Do you have enough time to use ILL?

Author's network:

• How old is the account?
• Do some background research on fans and followers: Who is in their network and who follows them? Who leaves comments?

Reliability (of author and content): 

• Can the information be verified from other sources?
• Does the author have a Facebook, Twitter, YouTube, Instagram, blog, or personal webpage?
• What kind of content is showcased on these pages?

Contextual updates:

• Does the author usually post about this topic?
• If so, what do past or updated posts say?
• Do they fill in details as they occur?

Geography:

• If the blog features breaking news content, is the author near the location of the event?