Was she tweeting from a personal or company account?

The same one she sent this joke about sexual humiliation from:

https://twitter.com/adriarichards/status/312265091791847425

And the company she was envangelising for on that twitter feed thinks that a visual joke about photocopying your genitals is not inappropriate for their jobs pages:

http://i.imgur.com/uWc8P39.png

I understand that speaker and context make all the difference, but she made a joke about sexual humiliation, and then, at the same conference, got offended by a joke comparing dongles to genitals.

I was responding to "Her role is to speak for the company"

But yes, you do point out something strange about her tweets. Unfortunately, many people approach this issue with a double standard

She was using her personal twitter account as an extension of her job, which does make her comments 'speaking for the company'. It's part of the role of a tech evangelist.

If she was not comfortable with this, she should have maintained a greater separation between her professional and personal online behaviour.

From her account associated with sendgrid:

https://twitter.com/adriarichards

She says she works for SendGrid but I thought people usually use a separate corporate twitter account (or set up a different one for those issues)

One of the minor side-problems in this story: social media blurs the line between "personal" and "professional"/"company" communication. If you use your twitter account to network with people working at other companies, in your role as a developer evangelist, your personal account somehow turns partly into a company account.

Side note: She also tweeted "SendGrid supports me", which is a direct claim that her behavior is in line with company policy.