Turn off the sound
You open a website and suddenly you see the window covered during plenty of seconds by another red or green un-wanted window (according with the color of the brand that advertises). Some other times, an icon comes straight into your sight and you can’t turn it off because the button is quietly situated on the corner of the screen or it is quite missing. And… this is not all! You navigate on the web absorbed by your own personal interests and suddenly you are dined by an ad. As an advice: do not turn up the volume to the maximum… or you’d better use Adblock. 
From the group of annoying online ads, should also be remembered: unexpected pop-ups, ads that “move” the page content, adverts that float over the screen, advertisements with blink effect and, of course, the usual spams and their bothering offers and announcements.
Exactly as the TV viewers change channels at the adbreak, in the same way the Internet users are looking for ways of getting free from these annoying advertisements. An often-used method is blocking ads with special software. The most known are: Mozilla Adblock, Webwasher, AdSubstract, AdsGone, Norton Internet Security.
These are tools that make advertising pop-ups to be invisible or that use filters for blocking them.
Any company that intends to promote an online brand should also consider these things that I wrote above in its marketing strategy.