I'll start with your first question. In general, the use of messaging apps for news, things like WhatsApp or WeChat.... When people say they use that as a source of news, they are more likely to then also believe in misinformation.
It is in the scheme of these types of media, which are among the worst in terms of their effects on people's belief in misinformation. It is a concerning way in which people are accessing news. There is an inherent trust in the media that you receive through these messaging apps that come from friends and colleagues. It's different from news presented on a feed, where you might just scroll on by. It has a higher likelihood of being read and a higher propensity to be believed.
If I misunderstood your question, please feel free to elaborate.
The second question was, do people trust political parties? We haven't directly asked that question, so I couldn't answer that.