Regarding point 1, my colleague wanted to say that currently you can schedule content items for publishing or unpublishing, but this is not what your scenario requires.
We do not have a job scheduler components yet in the system.
As for the Twitter and Facebook pipe, the Twitter Pipe is ready to be used, while the Facebook one - not yet. It will not be done for the official release, I hope that we will be able to do it right after that.
We are currently producing the documentation for the publication system. In short, the Twitter pipe works as follows:
1. You register your application (Sitefinity web site), because twitter requires all applications to have be signed with a key
2. You should be able to associate your user with that application. Just create a new user from which the tweets will be posted.
This all you have to do.
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