Nope, then the employer will assume you must be covering something up (which is true) and not hire you "just in case".
Not if you fill thousands of other profiles with the same rubbish too. Then it's a level playing field.
Again, that sort of thing will be tough to do based on what we've built. You can't just spin up new account programattically. You have to use a verified Facebook account with a sufficient level of activity to prove humanness.
We're committed to implementing countermeasures that prevent bad content from coming onto the site. In similar fashion to how Reddit Karma and other reputation systems moderate content and kick off bad actors.