Pretty sure they're solely on Tumblr and AO3. But they also reblog every single one of those 'cute OTP AU ideas' posts, especially the ones that revolve specifically to coffee shops, so I think they just reeeeally like coffee shop AUs. I've never been into them personally, but that's probably because I've never been into the whole 'lets hang out for hours in a coffee shop' thing IRL. Which is probably a generational thing - when I was in my late teens/early 20s everyone hung out in pubs.
Re: TFA fics versus other fandom fics
Pretty sure they're solely on Tumblr and AO3. But they also reblog every single one of those 'cute OTP AU ideas' posts, especially the ones that revolve specifically to coffee shops, so I think they just reeeeally like coffee shop AUs. I've never been into them personally, but that's probably because I've never been into the whole 'lets hang out for hours in a coffee shop' thing IRL. Which is probably a generational thing - when I was in my late teens/early 20s everyone hung out in pubs.