A lot, see that yet another recent study:
<a href="http:&#x2F;&#x2F;www.talentsmart.com&#x2F;articles&#x2F;Multitasking-Damages-Your-Brain-and-Your-Career,-New-Studies-Suggest-2102500909-p-1.html" rel="nofollow">http:&#x2F;&#x2F;www.talentsmart.com&#x2F;articles&#x2F;Multitasking-Damages-You...</a><p>I use an Android phone that lasts consistently more than 2 days (Sony z3 compact). Of course I don&#x27;t have Facebook installed...