Today, Twitter is beginning the biggest change to its service in years.

The new chronological timeline is an expansion of this.

The new timeline wont be purely algorithmic, though.

Heres how Twitter describes it:

Heres how it works.

The rest of the Tweets will be displayed right underneath, also in reverse chronological order, as always.

So if you scroll up or down enough, youll eventually get back to reverse chronological tweets.

Its like the While you were away feature, just bigger.

For those who like Twitter the way it is, dont panic.

Initially at least, this change will be opt-in.

You have to go into your apps configs so you can turn it on.

Twitter may change its mind before then.

At least for now.

Never miss important Tweets from people you follow| Twitter viaThe Verge