It doesn’t overwork your battery or overuse your data connection. It’s worth noting that this app takes up little to no resources while it runs in the background.
Your contacts can see it when they open your chat window. This is comparable to a tweet on Twitter. Another growing trend is the WhatsApp status banner that’s easy to set up. With this, you can view and interact with the app on any browser. The most convenient addition is WhatsApp web. The developers add new features constantly.