@zatnosk
this is an interesting idea!!
i think mastodon provides rss feeds by default? I'm not sure, will look it up, but i know write freely certainly does. having it ping-back for favs and how to deal with boosts would be cool to see
public protocols for rss sync are fairly limited from what i know. there's at least two competing standards (greader and feedburner? something like that) so that would also be a cool problem to solve!