How did the whole “Social media” thing start? What would you consider the beginning of the social craze?

The hottest thing, Which ones do you have to be on?
Let’s run through the functions of each…. (EG: Twitter, Linkedin, instagram, FB, youtube, pinterest…)
What’s working to grow your business?

Any special tips for growing your … followers

Future:

So what trends are you seeing?
What’s up and coming?
Where do you see all this going?
Industry specific social media…