Impact of Facebook Like button on images
At Elasticera we have known for some time that Facebook makes a huge number of image requests on a daily basis.
The following graph shows what % of Bot requests Facebook accounts for across all of our customers.
A surprisingly high percentage. However this does not tell the whole story. Not all of our customers use Facebook Like buttons with their product images.
The following graph shows what % of Bot requests Facebook accounts for with a customer that uses Facebook Like buttons with their product images.
Facebook could save websites and themselves an awful lot of bandwidth / CPU cycles if there was an attribute for the image tag.
<img class="rounded" src="blah.jpg" hash="SHA1-of-image">
Facebook could then send the hash with the Like request and if Facebook has the image with that hash it does not need to request it.