Self-named - rb file required in Gem lib directory?

Rails
1

Hi,

I just installed the rFacebook Gem. It turns out that when I start my
app, I get the MissingSourceFile error - cannot require ‘rfacebook.’

The rFacebook gem does NOT have an rfacebook.rb file in the gem’s lib
directory. After I added a blank file named rfacebook.rb, the problem
was gone.

I noticed most Gems have a like named *.rb file in the lib directory.
For any given Gem called “foo”, is there supposed to be a “lib/foo.rb”
file in the gem folder?