I seem to be getting the following when I execute npm install bower -g
/usr/local/share/npm/bin/bower -> /usr/local/share/npm/lib/node_module
My problem was the Homebrew/node/npm bug found here - https://github.com/npm/npm/issues/3794
If you've already installed node using Homebrew, try:
npm update -gf
Or, if you want to install node with Homebrew and have npm work, use:
brew install node --without-npm
curl -L https://npmjs.org/install.sh | sh