Each week Joshua Fruhlinger contributes This is the Modem World, a column dedicated to exploring the culture of consumer technology. I was never a fan of push notifications. The only alerts I wanted to get while my phone was sleeping included calls, texts and super-important reminders. I didn't need to know if someone liked the photo that I shared. I didn't want to be notified if I hadn't played a particular game in a few days. I'd get around to it. I'd find out on my own. But lately, mobile operating system makers are pushing the push,