Remember how annoying it was when someone had an instagram handle which is different from their twitter handle. You thought million of times whether to mention them on instagram and not share it on twitter or not to mention them on instagram and share it on twitter.. There’s nothing worse than that!
Instagram solved this major pain by translating it’s mentions to correct twitter handles in tweets.
Now let’s say you have different instagram and twitter handles, when someone mentions you on instagram and shares it on twitter, instagram will automatically translate your username in the tweet to match your twitter handle, and this can only be done when your instagram and twitter accounts are linked.
Massive improvement. Great job instagram team!