Thanks - now I see a practical application for tweets. My step-daughter signed on to a thing called "pinterest" - apparently it does something similar? All I know is that I see it when she "likes" something.
pinterest is like having your bulletin board available for everyone to see
you "pin" stuff from website you like onto your pinterest board so you don't write anything just put up "pictures" of stuff you like
others can comment on your "pins"
people organize their pins into categories--some are pretty silly--places I like, shoes I love,