i enjoy it..it allows me to connect with friends in different parts of the country..my job took me all over the place & many of my friends work hither & yon...this way we can easily share pix & "chat"

do i carefully select for friends people i don't know? yes.
do i watch what i post? yes.
does it control my life? no.

i think it is just one more way today to connect with people..no different than e mail, cell phones etc...& with each one you need to use caution & not be stupid or extreme.