A great summary Mary. Something I'd add to point 4, is to also post content that's NOT about your organisation. For example, articles relating to trends in your industry, new roles or job titles in your sector, clever ad campaigns from non-competitive employers. Stuff that's fun and interesting to prospective hires, and keeps them coming back to your feed.
Also, what about Tweet-Ups hosted by senior staff, to discuss pressing or interesting industry issues?
A great way to build a talent pipeline. Thanks again for the great content. Cheers, Rick