Advertising on Twitter can cost nothing more than your time or it can cost a very large amount of money if you wish to hire somebody else to do it for you. My advice with that would be to check Twitter's guide to business (http://business.twitter.com/twitter101) for more information about using Twitter with your business.
An artist can advertise their shop/artwork on Twitter.
By making an account for your business and then sending tweets about it.
You can't gain money through Twitter. You can only advertise a product/service/shop.
Companies can advertise when they are looking to recruit.
Joining Twitter is free, using Twitter is free.
No twitter is a free social networking association. The only profit they make is from letting other businesses advertise or create a partnership with them.No Twitter is a free service like facebook
Advertise it to friends family(if Its Aproporiet)Post it on Twitter,youtube,Ect
No.
Twitter does not cost anything after you sign up. It is an absolutely free service for users.
Companies pay to advertise on social networking sites.
Twitter does not cost anything.
ALOT