Many Facebook groups got an update Wednesday night that displays members’ profile pictures in the header and allows admins to add a cover photo like they can on Timeline.

When we first saw this feature three weeks ago, the top panel included smaller thumbnail images of several more group members. Now, only up to eight members are featured at a time. The order seems to be based on which members were most recently active on the page. Clicking on a thumbnail leads to the person’s profile.

Group admins can decide to add a cover photo instead of showing members’ pictures. The maximum size allowed appears to be 800 pixels wide by 200 pixels high — smaller than Timeline cover photos. Cover photos can be changed by hovering over the top right corner of the group page, which might not be intuitive for some users. There is no prompt in the group creation flow or in the ‘Edit Group’ dashboard. And unlike with Timeline, group cover photos do not show in the mobile version of Facebook.

We expect the social network to announce Timeline-like features for fan pages at the end of the month.