Create a "Twitter Card" for events

[dhedlund]

When sharing an event on twitter, it would be nice to take advantage of twitter cards to show additional information in the tweet. See:
https://dev.twitter.com/cards
https://dev.twitter.com/docs/cards

[techieshark]

+1.

Once we implement open graph meta tags, it looks like we'll just need a couple twitter tags for this to work:

• twitter:card = summary
• twitter:site = activatehub

Also interesting to add might be twitter:creator, which is the twitter username of the content creator (which could be the twitter handle for the individual or organization promoting the event).

https://dev.twitter.com/docs/cards/markup-reference

[lindsaycaron]

Also, shortened URL for social sharing, esp Twitter.