I will second Verne. I found his style to be very approachable and was rarely bored.

We are doing things that seemed difficult on an immense scale: Fission and Fusion.

Like solving problems currently applicable to stuff on Earth. Dunno' maybe outmaneuvering volcano ash?

The aliens would be mass broadcasting tweets and stupid facebook pictures to the entire universe.

That's exactly what I was thinking. Flash has been out since 1996 (http://en.wikipedia.org/wiki/Adobe_Flash_Player) and the HTML5 specs started in 2004!

Would you say that it's difficult to break into the Microsoft Windows or Mac OS X kernel community?

... protecting government infrastructure from computer attacks. (http://www.washingtonpost.com/wp-dyn/content/article/2009/12/22/AR2009122203789.html) ... preventing leaks on blue prints/details of military hardware (prototype or otherwise) (http://www.usatoday.com/news/washington/2009-03-02-marineone_N.htm) Fellow ./ readers may be able to add a few more venues that need attention.

If you have a lot of conspiracy theorists, all trying to find a conspiracy over a long period of time, chances are there may be a few that correctly (or close enough) guess. http://en.wikipedia.org/wiki/Infinite_monkey_theorem