Business Directory vs Social Media vs Forums vs NewsSE - suggestion

Hello,
A) Thinking to start a business directory like Yelp, JustDial, etc
Vs
B) Social Media sites like Facebook, Linkedin, etc
vs
C) Forums like CitiData, DigitalPoint, etc
Vs
D) News Search Engine just like the Google News search Engine (in many languages) to have news updates every minute in many languages

1) Need your suggestion guys, which one or more are good ideas, and which one or more are not good ideas?

2) if you like one or more ideas, please explain why do you think it would be...

Business Directory vs Social Media vs Forums vs NewsSE - suggestion WordPress ...