Traffic is the life blood of all internet marketing. If nobody visits your site, there will be no sale, no referral, and no money – an empty fridge.
There are many sources to get traffic on a website:

Buying traffic
Search Engine Optimation
Article marketing
Email
Social media traffic like Blogs, YouTube, Twitter, and Facebook….
Viral marketing

But what [...]

It is easy for a government to block email or a website. And they know why they require internet and mobile phone providers to integrate the necessary equipment into their networks.
But it is almost impossible to block communication thru Twitter, combined with YouTube and Facebook, as the Iranian government learnt last summer.
Why is this?

Twitter, [...]