This should not be downvoted. One sees the source before the colon more often than after the colon, but it is common to see the source after the colon in some publications. I see several instances (e.g., "Corporate lobbying helped derail border tax: senior Republican") on the Reuters homepage right now.
Forget it, Jake. It's Chinatown.
When the source is leading it makes sense...
Source: Headline
This reads much better
> TheStreet: Facebook to launch news subscription product
I just said that it's correct. Which it is. If you don't like it, great.