Here is the complete list of Facebook Timeline Sizes and Dimensions
Cover Photo for Timeline
This is the big image (also known as cover photo) for Facebook’s timeline.
Application Icons for Timeline View
If your picture exceeds these limits, your icon will be re-sized and converted.
Maximum file size: 5MB
Profile Picture for Timeline Pages
Recently updated sizes for timeline. The new width and height are 180 px which will be automatically scaled down to following:
It’s extremely important to choose a picture that can be scaled down as the profile pictures that are displayed on timeline posts are really small. Best practice is to choose the logo.
Facebook Application Favicon Size
This is the tiny icon that is being displayed on the left hand side of your news feed, where the applications that you use are.
Facebook Page Applications (Formerly Facebook Tabs)
The usable area of a brands Facebook page
Width: 779px (Update: The CSS of Facebook has some errors, so we’re not actually sure what the final width will be. We suspect it will be 810 px)
Facebook Milestone Picture Size
This is the size you use for milestone pictures such as company’s foundation date. This is also the size for starred (highlighted) posts. The image in the post will be scaled down accordingly, if it exceeds the limits.
Width: 843 pixels
Height: 403 pixels
The image that is displayed next to the link when you click like or share somenthing.
This is the maximum size of the image you can upload.
Pinned post picture size
This is the size of the picture of your pinned post. It will not be scaled down, Facebook will take the center of the image and cut it out accordingly.
Pictures displayed in Facebook
This is the maximum size of the image as shown in slide show or album.
Picture in the ad
Text in ad
Header: 25 characters
Body copy: 135 characters
Facebook status update
Status update length: 63,206 characters
Comment length: unlimited
The maximum size of video you can upload
Length: 20 minutes
List and Image: Special Thanks to Dreamgrow