Why is my URL sharing with an outdated tagline/opening text?

When I share the link to my site on Facebook, it shows an outdated tagline and old text. Is there a way to fix this? My site is http://www.namemynovel.com/

I asked this last night but I think the staff member who was helping me might not have been in or had time for this today. I'm hoping to launch my site tonight. My site is set up for WPMUdev staff support in case you need to test it out. This happens when I share the link name or use the FB share button. Thanks for your help!

It looks like this when I go to share:

NAME MY NOVEL | Enter Your Suggestion For A Chance To Win
Home Name My Novel will be ready soon! Please check back later this week to enter the contest and participate in the fun!