Despite the hype of business chat messaging and a perception of smartphones introducing a connected work-everywhere lifestyle, a surprisingly large number of bosses are not at all happy with the proliferation of the devices.Why I switched back to FirefoxRemember when you ditched Firefox for Chrome and pinkie-swore you’d never go back? Yeah, me too.READ NOWThe honchos say mobile devices are killing productivity, according to employment firm CareerBuilder research. The problem appears to stem from the fact that employees are indeed using smartphones at work—just not for work.That the majority of workers with smartphones (65 percent) don’t have work email setup on the devices is one issue, the CareerBuilder study found.The resume distribution company performed its survey of human resource managers and employees along with Harris Poll earlier this year.Distractions kill productivitySeventy-five percent of corporate employment chieftains say “two or more hours a day are lost in productivity because employees are distracted.” And those distractions include non-work personal messaging by employees who bring a smartphone to the workplace but don’t have work communications on their device.Although employees are able to take work-related tools, such as email and cloud documents everywhere, including home on the weekend, workplace productivity has declined, the bosses believe. They think workers are slacking partly because of excess connectivity.+ Also on Network World: How to avoid workplace distractions +“While technology helps workers stay connected while away from the office, in many cases it is causing them to disconnect while in the office,” CareerBuilder says in a press release.Personal messaging makes up the biggest share (65 percent) of non-work related activities on smartphones during worktime, the study found. Weather, news and game websites are also prevalent during office hours, as are dating, adult and shopping sites. Gossip sites make up 7 percent, and traffic sites 12 percent.Over half of employers (55 percent) blame mobile phones and texting for the supposed productivity slump. That number beats out traditional office gossip, which did surface with 39 percent of the managers blaming idle chatter as the biggest productivity zapper.