On what occasion can be fragments acceptable?

I read this excerpt in the Reader's Digest

"Canning. Food Trucks. Knitting. Urban homesteading. Home Brewing. The rise of these DIY activities amuses me."

Thanks for asking this great question! Seriously. It is an interesting question, because in the English language rules are broken all the time!

Google this: poetic license

When you write a paper for school, it is best to always use complete sentences. If you use poetic license and write a fragment, you might make the reader think you do not know the rules of grammar. However, if you blog on the Internet or write a story, you really can use fragments when you want to as long as it sounds good.

This is not good:
I like to eat pie. My favorite food.

This is complete:
I like to eat pie, my favorite food.

This is okay sometimes:
I like to eat pie, because it is the greatest food. Blueberry Pie.

But really, you should not use fragments in formal, academic writing.

Thanks Susan, I got the idea now.