A standard industry term used in email marketing to describe the act of "blasting" a message out to a group of hundreds or thousands of people simultaneously, similar to the act of "blasting" a verbal message out with a loud speaker. Typically used to differentiate between two-way email interactions (where a customer emails a question and the company responds), and one-way bulk email interactions (such as newsletters or promotions).
When you look at all of your old comments/pictures on MySpace and Facebook and see how your friends used to act and treat you.
I was having a fight with my boyfriend and then I went on facebook and found a picture of us from 3 years ago and read how hot he thought I looked in that bikini. Thanks to that e-blast from the past we're happier than ever.
The online version of being 'put on blast' by a friend who wants to embarrass you. It occurs when embarrassing personal affairs are made public through one of your social networking profiles, usually perpetrated by the wild and reckless stoner friend who will never be bothered with looking for a job.
My friend put me on e-blast before I could remove his post from my Facebook page. Now, my coworkers have seen that...ahem...photo, and my mom keeps asking me about my 'fetish'.