When you visit a website such as a clothing store and view or add products to a cart there. You might be noticing those very same products appearing on your Facebook wall as a ‘suggested post’. This is because this company has chosen to display an advertisement to you based on your visit to their website. You can however choose to disallow the results of such invasions of your rights to privacy, but you might not be able to stop the tracking process without leaving Facebook.
Anyway. The process of cleansing your Facebook timeline is quite simple, just visit your Advert Preferences and turn off the features that you do not want Facebook to use for personalised advertisements.