Facebook today unveiled an updated design for News Feed that includes larger photos and separates stories into individual modules, similar to the layout for Timeline and the mobile feed.

Just as user stories are richer, advertisements too get more engaging visuals in many cases. At the same time, ads have a new prominent “hide” button that is not hidden under a drop-down menu, as it continues to be for most non-sponsored content.

See a comparison of page post ads with social context before and after:

Page Like Sponsored Stories before and after:

The redesign is rolling out to a very small percentage of web users over the next few weeks, so Facebook says the overall performance of marketer’s organic and paid media will not likely be affected. The company says it will assess the impact of the changes before they roll out further.

Facebook says the assets that advertisers are using for their page posts, ads and Sponsored Stories can remain the same, even with the new layout. However, Facebook may display them differently. For example, the right-hand column is wider, but the size of ad images there hasn’t changed. See more examples of how ads look in the new format below.

Page post photo ad:

Page post link ad:

Page post offer ad with social context:

Page Like ad with social context:

Page Like ad without social context:

We’ll update this story with more screenshots as we see different ad types in the feed.

This is a look at how sidebar ads appear on the homepage:

Facebook CEO Mark Zuckerberg says the company hasn’t made a final decision about when ads will appear in separate feeds like the one for pages, photos or music, though he says the goal is to eventually open up those feeds to sponsored content. For now, we’ll probably see Facebook testing different ad types and frequencies in each feed.