In one embodiment, a computer-readable medium comprises code representing instructions to cause a processor to receive a fetch response based on a webpage address that may be associated with a webpage. The code can additionally represent instructions to calculate a webpage validity score for the webpage. The validity score can be based on at least one of content or metadata associated with the webpage. The code can also represent instructions to cause the processor to store a thumbnail image of the webpage, along with an indicator of the validity score. The validity indicator can be based on the webpage validity score and a threshold value.