Suggestion for Dashboard and activity page.
In those pages, YouTube videos and some large images are always overflowing from the area.
The width of feed_item area has only 604px. But the video size in “video post” feed is set to 640×360px. It should be changed into nowadays default YouTube video player size 560×315px (or more smaller size). Perhaps, you will be able to fix it soon by changing the setting in your CMS.
Image size in “image post” feed has no problem.
It’s a bit more complex to fix video’s and image’s size in “wall post” and “comment post” feeds.
At first, add a notice to the comment post window like “images are displayed smaller than ***x***px”. and display all images forcefully within the size by CMS setting, JS, jQuery or CSS.
Then, install jquery plugin or something which enables displaying a image in original size in new window or enlarging it in the place when mouse clicking.
Now, the width of wall post is set to 582px, comment in entries is 592px and item_feed for them is 579px. So, image should be also smaller than 560px in this case.
I have no good idea for overflowed video in comment/wall posts except for overwriting its width and height by css (I’m doing it for “video post” feeds by custom css using stylish). But users usually embed videos with YouTube’s default player size (560×315px or 420×315px). So it doesn’t need to be acknowledged as a problem, as of now.