Really simple syndication (RSS) takes the content of a website and packages it into a feed that can be easily displayed on other websites. Aggregators take multiple RSS feeds and combine them into a single interface, which can help people track updates to multiple websites at once. RSS also allows websites to syndicate content from third parties.
Whether you choose to do your marketing online or offline, one thing does not change. This is the concept that no single marketing strategy will be as effective as a combination of two or more marketing strategies.