They need to send out some more invites with what you say there on the home page.
Time for a new/changed Libertarian group?

Perhaps, but I still think that an enlarged scope (beyond the US and beyond the US Libertarian party) would be wise - and perhaps even necessary - as well

We need to tell him to pull his thumb out, and do something to make the group active or we'll just start another one.
I think the somewhat narrow focus of this group is missing out on a lot of people who might be interested in libertarian ideas but not the US Libertarian party per se.
To be precise, I think it is missing out on those outsdide the US and those who don't see the Libertarian party within the US as a viable/worthwhile means of investment given the makeup ("two party", "first past the post", etc.) of the US electoral system. Indeed, it might even be missing out on liberty-minded peoples who don't believe that political action is the prime way to change the world...
As such, I suggest this group expand its scope to cover Libertarian ideas in general, ones that would interest and attract people world-wide who might utilize this site. Either that or that someone here (not myself) start up a new libertarian group that covers a wider scope if the founders of this group are highly dedicated to the single cause of the US Libertarian party.
I think that the change I suggest would do much more to promote libertarianism - both inside the US (see Ron Paul for example) and outside the US - than this group currently is.