Answer:
They provide real-time communication which has two flaws. The first is that a history can be kept of your conversation. Even if you have your history turned off, the other party can be keeping it. So it is vitally important to watch what you say. Secondly, the conversation can often have other parties listening in or saving your conversation without you knowing it.
It is vitally important that you get an Internet Security Platform to protect your identity and your conversation. Without such protection you are at risk of the security problems inherent in the design of the Internet that millions of hackers and cyber criminals are exploiting daily.