Twitter is good for business while facebook is good for making social cotacts

Both Twitter and face book are helpful for promoting the business.

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Both are useful to obtain organic traffic and to promote your business in the internet world easily.

it depends on your skills but the most famous is facebook

Facebook
 

Facebook is easy way to reach a people

I like Facebbok...

Better go with Facebook, because it is widely used...

Both are better for generated traffic for your website.

Facebook is more popular for promoting website or products..
Because facebook is more user friendly...

Depends on what you're looking for. Both have passionate audience who love being there. And the behavior of the users vary. So if you wanna appeal to the masses and get into a conversation with anyone or anything trending, use twitter. Otherwise, facebook is best for you!

I would choose facebook, but I think both are needed to cover your bases.