The update can be seen on both the Android and iPhone apps, and on Twitter.com.
Response from users has been mixed since the update took effect:
My fave update in a long time. Update your Twitter app to see more photos + videos + faves right in the timeline: https://t.co/kDaXj3G2W7
Others complained the preview inclusion was distracting:
Here's my 2 cents on the Twitter image previews: Not good for work.
Did I accidentally put @Twitter on the 'suck' setting or is everyone else automatically seeing pictures in their timeline? #NationalCatDay
Seriously @twitter first you add stupid blue lines joining CRAP together, and now pictures always showing. DO you ask your users? #idiotic
The update is the second in recent months to divide users.
In August, Twitter rolled out a feature which linked conversations with a thin line (blue, for most users) joining up to three tweets together in chronological order. In order to see the full conversation, users have to tap on the first tweet.
Both recent changes made by Twitter make the user's feed similar in appearance to that of social networking rival Facebook.
I'm not a fan of the thin blue line, because as someone who regularly looks at Twitter throughout the day it means the same conversations appear over and over again. While I found the new preview feature initially promising, it soon grated, as the same images now appear repeatedly on my timeline. Like Facebook, you're now likely to have your timeline spammed which whatever image is going viral at the time. Enjoy.
Perhaps Twitter could placate disgruntled users by simply offering an option to turn these features off.