How to design multi-dimensional cross-feed flow (database design, home display information)

Recently doing a simple quiz on the website
The following four elements are now available
person, topic, question, answer
How to design a database (MySQL)
People can focus on people, topics, problems
Problems can have multiple topic tags
The Feed Stream (Home page display) can be mixed to appear:

1. The topic of my concern new issues

2. New answers to the questions I care about

3. Questions raised by people I care about

Feel the database is not good design, the first page of the data how to mix and display different information?

Reply content:

Recently doing a simple quiz on the website
The following four elements are now available
person, topic, question, answer
How to design a database (MySQL)
People can focus on people, topics, problems
Problems can have multiple topic tags
The Feed Stream (Home page display) can be mixed to appear:

1. The topic of my concern new issues

2. New answers to the questions I care about

3. Questions raised by people I care about

Feel the database is not good design, the first page of the data how to mix and display different information?

can design a special feed flow table, this table can support the first page display can also be used as information collection table.

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