There are a lot of documents available and it can be time consuming to analyse them qualitatively
Taking news for example, there are thousands of news items published every day.
You also need to distinguish between ‘real and ‘fake news’.
Also, in the postmodern age where fewer people get their news from mainstream news it is necessary to analyse a wide range of media content to get representatives, which makes this more difficult.
Because there are so many documents available today, it is necessary to use computer assisted qualitative analysis, which effectively quantifies the qualitative data, meaning that some of depth and insight are lost in the process.
With personal documents, gaining access might be a problem
Personal diaries are one of the most authentic sources of information because people write them with no intention of them being seen.
However, they may not be willing to show researchers the content because they say negative feelings about people close to them, which could harm them.
Blogs would be easier to access but the problem is people will edit out much of what they feel because these are published.