Using words that work with the people you're trying to persuade. Don't reinvent the wheel. Study and draw inspiration from great copy that works. I'm not talking about copy that you personally think is great. It's a mistake to judge advertising like regular people do - as entertainment.
2012 is the year where social media oversaturation hits hard. We will scale back on our participation in social networks, and we will most certainly scale back who we choose to follow as sources. This won't be because someone is bad or good.