[tarasmatsyk]

Smart,

what about using words (like a password phrase) instead of a hash? You can schedule title of the upcoming tweet, so people can like it and "subscribe" to notifications

[edent]

I'm not sure of any hashing algorithms which use words as their output. Or have I misunderstood your comment?

[renewiltord]

It's just a byte string converted to a hex string commonly. Chunk it into quads of hex and you can index into a 65k dictionary (the OED has more than twice that).

[appleflaxen]

even better than a dictionary: use dicewords, which have already mapped numbers to a canonical list of words.