Often it is second-hand information.
Often simplified, incomplete, sensationalistic, or biased compared to real research.
Not acceptable as reliable evidence of anthropological phenomena if it is presented to knowledgeable readers of your work
Its citations to other work are informal, and therefore tricky to identify and find the original. Ask a librarian.
To face questions that can only be answered. . .
using specialized methods
by many researchers building upon each other's work
through decades of research
Dense and slow reading. The authors assume background knowledge you lack. Seek overview articles to fill in.
The articles usually have a much narrower focus than what you hope for.
Long articles.
Finding relevant articles is harder than finding a cool restaurant on Google. You have to do more thinking and experimenting.