Check the account history of the source. Two red flags are: the number of posts and how long the account has been active. If it claims to be a well know source (like CNN or CBS) and only has a few posts in its history that is a clue. If it's a well know source and the account has only been active a short time that is another red flag.
Images of an event are often reused to deceive people. You can check if an image has been used before on a reverse image search service like TinEye.
With resources like Google at our fingertips, information isn't hard to find. What is challenging is determining whether that information is credible and can be trusted. Is it factual? Biased? Relevant to your topic?
A Google search is often our first stop to gain a basic understanding of the main ideas about a topic, but since anyone with access to a computer can publish anything online, it is crucial that you evaluate the information you find, especially when completing a research paper, or looking for important information (like health or financial information).
Web sources can be particularly hard to evaluate, so here is a handy acronym to help you determine if a source may be CRAAP.
Currency: the timeliness of the information
Relevance: the importance of the information for your needs
Authority: the source of the information
Accuracy: the reliability, truthfulness, and correctness of the content, and
Purpose: the reason the information exists