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The Twitter icon is a little blue bird. Presumably they used a bird as they 'tweet'
Tjetz is a famous twitter icon .
To calculate the pixel size of an image, you need to divide the width or height of the image in pixels by the physical size of the image in inches. This will give you the pixel size per inch.
Your header is the picture behind your icon and bio. (Your icon is like your profile picture)
The answer depends on the size of the pixel!
You can't copy and paste images on Twitter.
You have to be a translator and contribute to translate parts of Twitter into other languages.
Save a gif to your computer and upload it as your profile picture on Twitter.
If you have a custom icon you can simply upload it where you would normally upload your display picture.
A pica is a unit of type size, a pixel is a unit of illumination.
Twitter doesn't store a "history". You can delete a tweet by hovering over it and clicking on the trash can icon.
To get the follow me icon get the like button code through your Twitter account. Then copy paste this code into your tumblr blog. Go to Tumblr Dashboard >> Your Blog >> Customize >> Edit HTML Here paste the Twitter like button and place it properly.