I use certain types of extension depending on the type of site I'm created.
For instance:
.com - Community Site
.net - Network Site
.org - Organization/Business
.info - Informational site
.me - Personal blogs
.co - No clue 😀
.us - United States
but you can also use extensions as part of the site's name
For instance:
FreePostsFor.Us
TheGamers.info
HowToGet.In << Random 😀