Looking on the internet deeply has found these results:

It is not. is the most popular phrase on the web.

It's not. 156,200,000 results on the web	It is not. 14,550,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Dina Rose It's Not About the Broccoli Book. Grand Rounds Presentations; Early Childhood Educator Seminars; Parent Workshops; Corporate Lunch 'n Learns. Aug 5, 2015 ... It's Not What It Looks Like Click Here to See the It's Not Dead Festival Map ... vendors@itsnotdeadfestival. com \| © 2015 It's Not Dead Festival 2015 The Department of Magic and Secrets. It's Not You, It's Men, featuring international movie star, author and platinum ... It's Not You, It's Men is produced for OWN by CBS Television Distribution in ... Cyanide & Happiness Shorts. ExplosmEntertainment. SubscribeSubscribedUnsubscribe 5,524,5145M. Loading.	It is not. Or that it is unimportant. It is not. In fact, a higher alert level is better from the point of view of first strike stability. This art is perforce avant It seems so obvious, and yet it is not. I can assure you it is not. This might sound quick and easy, but it is not. garde, and it is not. At first it seems impossible, but it is not.

It's not.

156,200,000 results on the web

It is not.

14,550,000,000 results on the web

More popular!

Dina Rose It's Not About the Broccoli Book. Grand Rounds Presentations; Early Childhood Educator Seminars; Parent Workshops; Corporate Lunch 'n Learns.
Aug 5, 2015 ... It's Not What It Looks Like
Click Here to See the It's Not Dead Festival Map ... vendors@itsnotdeadfestival. com | © 2015 It's Not Dead Festival 2015 The Department of Magic and Secrets.
It's Not You, It's Men, featuring international movie star, author and platinum ... It's Not You, It's Men is produced for OWN by CBS Television Distribution in ...
Cyanide & Happiness Shorts. ExplosmEntertainment. SubscribeSubscribedUnsubscribe 5,524,5145M. Loading.

It is not. Or that it is unimportant.
It is not. In fact, a higher alert level is better from the point of view of first strike stability.
This art is perforce avant
It seems so obvious, and yet it is not.
I can assure you it is not.
This might sound quick and easy, but it is not.
garde, and it is not.
At first it seems impossible, but it is not.