System and method for coordinating and monitoring a plurality of websites

A system comprising:

• a watchlist, stored by a non-vendor third party, that is associated with a particular user and includes product information from a plurality of vendor websites, wherein the plurality of vendor websites includes a first vendor website and a second vendor website;
• at least one first processor, of the first vendor website, configured to:
• produce a web page including vendor product information for a particular product, and
• produce a widget on a web site, wherein the widget on the web site in response to a user input from the particular user, adds the particular product to the watchlist by transmitting the vendor product information for the particular product to the non-vendor third party;
• and
• at least one second processor, of the non-vendor third party, configured to update the watchlist in response to receiving the vendor product information for the particular product from the widget on the first vendor website, wherein the watchlist is updated by the at least one second processor:
• adding the vendor product information for the particular product to the watchlist,
• identifying one or more related products that are related to the particular product on the second vendor website,
• adding the one or more relate products to the watchlist, and
• sending the watchlist to the particular user.