As a Pinterest member, you "pin" photos or web content, and then you create thematic categories, or "boards," to organize your pins.
(Some of the boards I've created)
For me, Pinterest was initially a place in which I could create those "inspiration boards" people sometimes use. No printing, no cutting, no cluttered boards on my walls - I loved it!
Recently, Pinterest has become more of a web resource than anything else. Looking for a good recipe for eggplant? Want to know how to make your own cloth diaper? Looking for helpful activities around grammar rules? Want to know the latest fashion trends? Pinterest has a wealth of information! Just type in the search box and see all of the pins every member has every created related to your search!
(The first 7 of many results I found for "homophones")
Pinterest has become particularly popular with teachers! Gone are the olden days when you had to sneak cameras into other teachers' rooms in order to steal their ideas! Nowadays, a lot of educators proudly post "pins" of their ideas on Pinterest, making them available to the rest of the world!
There are increasingly a lot of activities parents are pinning that relate to summer fun, toddlers, early childhood education and other goodies!
Check out my "Teach" board on Pinterest for fun educational activities and tools!

