New laws surrounding online privacy controls come into effect this weekend.
From today, websites are restricted from recording information about internet browsers.
European law means sites must ask for consent to use cookies which track users and customise their pages.
Firms which do not comply could be fined more than €600,000.
David Evans from the UK'S Information Commissioner's Office says various concerns have now been addressed:
"In some areas those cookies were being used to do things which might be seen as intrusive," he said.
"It was enabling organisations who you'd never heard of to create profiles about your activity and make decisions about you…to show you different content and different adverts."
The Irish Examiner ran a special investigation on the issues around online privacy this week.
