I've noticed on occasion after posting an answer I get the "Share your Answer!" bar with Facebook/twitter icons. Does this bar only show up when I first post an answer? I can't seem to find those options deliberately, and other some SE sites don't even seem to have them.
This only appears:
- a random percent of the time, decreasing chance with greater reputation
- on your posts
- if they are greater than 400 characters in length
- for 1 hour after posting