Facebook – How to post from blogger to Twitter and FB with blog label as # tag in post content

Contests/competitions/sweepstakes/etc

must not use Facebook features or functionality as a promotion’s registration or entry mechanism. For example, the act of liking a Page or checking in to a Place cannot automatically register or enter a promotion participant

and

must not condition registration or entry upon the user taking any action using any Facebook features or functionality other than liking a Page, checking in to a Place, or connecting to your app. For example, you must not condition registration or entry upon the user liking a Wall post, or commenting or uploading a photo on a Wall

and

must not use Facebook features or functionality, such as the Like button, as a voting mechanism for a promotion

See Facebook's Promotion Guidlines for the rest of rules and regulations.

Highly unlikely. If you contact Twitter through a support ticket (here), then they might possibly give it to you, but it's a potential data protection act thing and they probably won't want to give it to you.