An online advertising method which may allow advertisers to recruit a user of a websites to become an advertisement carrier, who may carry the advertiser's advertisements and display the advertisements to his fellow users in an online community. Since users in the advertisement carrier's online community have similar browsing interests, if an advertisement is related to the browsing interests of the online community, it may be better targeted at the users in the online community. The method may be used in, e.g., eCommerce, social networking and online photo albums.