Actually, being notified at unpredictable intervals, as a bit of random-reward, has effects on the limbic system similar to gambling and drugs. Onscreen notifications let you binge on these little pleasures: enjoyable, yes, but rarely productive.
Also to keep in mind: if you downvote this, you are probably an addict in denial! Our 12-click program is arranging meetings now in major tech hubs, check meetup.com for all the details.