I just noticed that Twitter updated their Tweet button. The changes are subtle, but are an improvement. The changes I noticed were:
â€¢ Updated Icon â€” They’re using a bird with a larger wing
â€¢ Color Change â€” The button is gray instead of light blue
â€¢ Button Size â€” The button width has been increased from 55px to 56px.
â€¢ Type Color â€” Has been updated to black
â€¢ Counter Width â€” Has less padding, and has been reduced overall.
I haven’t had a chance to compare the size of the image sprite, but I’m going to assume that it’s smaller.