Map to the treasures!

jj.mansfieldschools.com
Familiar waters...
kids.scholastic.com
A place where captains learn the stories of the seas. What pirate treasure can ye' find?
www.longestintheworld.com
The longest domain in the world! Such amazin' things as I've never seen. But can there be others?
www.boston.com
News of a sunken treasure, but can ye search for it?
www.twitte.com and www.faceboo.com
I heard some scurvy dogs try to trick thieves with bad markers on the map.
x.com
What be this trickery? Can a letter mark the spot? Examine the map closely to find the source!
gen.xyz
Top level domains can lead ye anywhere! But can XYZ mark the spot?
192.168.1.1
Far from familiar waters, where can this lead?
104.18.13.16
Yar! Lost at sea? Find some more different addresses for yer port!