The Problem

We want to build a prototype for an online bookmarking system, to be called PHPBookmark, similar (but more limited in functionality) to that available at Backflip:

http://backflip.com

Our system should enable users to log in and store their personal bookmarks, and to get recommendations for other sites that they might like to visit based on their personal preferences.

These solution requirements fall into three main buckets.

First, we need to be able to identify individual users. We should also have some way of authenticating them.

Second, we need to be able to store bookmarks for an individual user. Users should be able to add and delete bookmarks.

Third, we need to be able to recommend to a user sites that might appeal to her, based on what we know about her already.