You want to make it really easy for folks to copy and paste your content into their own infosphere. Here are some examples:
twitter:
FB:
Announcing “Sentient”, a full dome experience of ideas, light and sound created by MassArt students at the Boston Museum of Science Planetarium.
Wed May 29, 2 free shows, 6pm and 7pm
Wed May 29, 2 free shows, 6pm and 7pm
RSVP here http://massartsci.wordpress.com/rsvp/
and templates for image sizes: