Google has been accused of bypassing the privacy settings of users of the Safari web-browser.
The Wall Street Journal said Google and other companies had worked around privacy settings designed to restrict cookies.
Cookies are small text files stored by browsers which can record information about online activity, and help some online services work.
However Google says the story "mischaracterises" what happened.
"We didn't anticipate that this would happen, and we have now started removing these advertising cookies from Safari browsers. It's important to stress that, just as on other browsers, these advertising cookies do not collect personal information."
The Wall Street Journal reported that Google "disabled the code after being contacted by the paper".
Read more here.