The Japanese edition of Love Live! School Idol Festival: ALL STARS features daily skits starring two or more idols, across all three generations. These skits provide a huge amount of interactions and character development, but they're not available in the World edition. To fix this, @SIFAStheatre has been translating and posting these for the English-speaking community.
Reading through the collected episodes, I found myself wanting to be able to quickly jump to episodes featuring specific idols, or which mention specific characters. I also found myself wondering: which idols appear together the most? Which idols mention each other in conversation? So in a fit of fanac, I assembled a database indexing all these things, and offer this website for any SIFAS fans who harbor the same questions.
Be sure to look at Statistics and Patterns in the data.
NEW: Keyboard navigation. On the episode display, you can use the forward and back arrow keys to move to the previous or next episode; the [A] and [D] keys also work (as in the WASD direction keys games often use). Jump to the [F]irst or [L]atest episode, or use  and  for the same thing. There are also keyboard shortcuts for the main navigation icons: [S]earch, [L]atest, [R]andom, and S[t]ats.
Many thanks to @Eaglezs, co-maintainer of @SIFAStheatre, for providing many of the translations used here and for assistance in starting this site. Additional thanks to @ashichuu, who originated the translation project, and to the other translators who have contributed and are contributing translations: @camodr25, @LunasTLs, and @Takeshi973.