Are you asking how to tell what is official and what is fan made?
If so, for the official FS2 experience with the modern graphical upgrades, the mod you want is called (I believe this is still the latest version) "mediavps2014". For FS1, you'll want fsport mediavps.
Everything else is fan made, though Silent Threat Reborn retells a canon storyline with all of the errors fixed and the missions drastically improved, and in some places entirely replaced/added to). It's definitely worth playing, and is more or less accepted as the definitive version of the Silent Threat storyline, probably more so even than Volition's original ST campaign.
[EDIT]Oh and the 2^n is basically your post count, or the highest power of two that your lost count has exceeded anyway.