Well said bro....these things can really destroy all your time management. Also, you have mentioned them in the correct order. Procrastination is the biggest mistake that people tend to do. Also, other reasons are apt.
Well, WhatsApp is convenient to use with many features. But, there are some privacy and safety issues with it.
Yupp...there are a heck lot of features that need to be explored in the cameras. Many people are not aware of that and do not use them. So, do proper research while purchasing these cameras or phones and take the benefits of the users.