I know I'll inevitably take some flak for this, but it has to be posted.
A preface first: Awareness of this issue is most certainly a good thing and is most certainly required, however, it's advisable to do your research on this organisation in particular because they're not as good, wholesome and innocent as they'd have you believe.
If you're willing to take the time out to read something, I'd suggest checking out this blog which critically evaluates some pretty significant issues with the Invisible Children activist group.
http://visiblechildren.tumblr.com/
People will probably end up inevitably calling me a cynic, a horrible person, whatever, for posting this in any of the places that I have, but I'd rather be a cynic than fund and promote a group that at best is remarkably shady and at worst believes in funding direct, violent military intervention.
I'm happy to see people being made aware of this issue, awareness is great, but not necessarily through the means Invisible Children would have you go to. Like the blog says, don't just blindly follow it because it's
something, sometimes something isn't always better than nothing.