I find WhatsApp an extremely fascinating IM service. Why, you ask. Well… in order to add someone on WhatsApp, you need that person’s number. Asking for someone’s number might sometimes be a very awkward affair, but the existence of WhatsApp makes it all so smooth – the only thing you have to ask now is whether or not the person uses WhatsApp. But that’s not the only reason I like the app; unlike other similar apps, WhatsApp has a blocking option. Probably doesn’t help much for the real stalker who’ll end up texting you anyway, but if it’s a uh… tight-fisted person you’re dealing with… you might find that option delightful ^_^.