Snapchat is more reckless with addictive features than Facebook.
Currently, though, the trend is toward deeper manipulation in ever more sophisticated forms. Harris fears that Snapchat’s tactics for hooking users make Facebook’s look quaint. Facebook automatically tells a message’s sender when the recipient reads the note—a design choice that, per Fogg’s logic, activates our hardwired sense of social reciprocity and encourages the recipient to respond. Snapchat ups the ante: Unless the default settings are changed, users are informed the instant a friend begins typing a message to them—which effectively makes it a faux pas not to finish a message you start. Harris worries that the app’s Snapstreak feature, which displays how many days in a row two friends have snapped each other and rewards their loyalty with an emoji, seems to have been pulled straight from Fogg’s inventory of persuasive tactics. Research shared with Harris by Emily Weinstein, a Harvard doctoral candidate, shows that Snapstreak is driving some teenagers nuts—to the point that before going on vacation, they give friends their log-in information and beg them to snap in their stead. “To be honest, it made me sick to my stomach to hear these anecdotes,” Harris told me. (Source)