Publish replies/favorites/re-posts to Tumblr

[npdoty]

As I mentioned in IRC and similar to #270 and #271 it would be nice if a Tumblr account could exist (either per user or system wide) that would syndicate the appropriate action out to Tumblr, so that you could "natively" interact with your friends' Tumblr posts but have all the content all on your own site.

[snarfed]

oh man, totally!

the implementation notes in #270 largely apply here too. bridgy already supports tumblr signup, API usage, etc, which gives us a leg up. we'd need to add tumblr to activitystreams-unofficial to implement the actions (like, reblog, reply, etc), but that's very doable.

[tantek]

FWIW incremental support here would still be quite useful, e.g. I'd likely use them in this order:

• support POSSE likes of Tumblr posts to Tumblr (as a native Tumblr like)
• support POSSE replies to Tumblr posts to Tumblr (as a native Tumblr reply/comment)
• support POSSE reposts of Tumblr posts to Tumblr (as a native Tumblr reblog)

[snarfed]

if anyone's interested in tackling this, i've written up comprehensive instructions on how to add a new silo to bridgy. feel free to jump in!