I encourage people to involve themselves and do whatever they feel comfortable doing to get their candidate elected. If they're comfortable making phone calls, start dialing. If they're comfortable knocking on doors, hit the bricks. If they're comfortable writing letter to the editor, start writing. I'm comfortable with graphics so.....
Maybe most important, don't waste energy preaching to the choir. Engage with mixed crowds. I've had some very productive conversations and arguments with the left on twitter. In one case a black Ferguson resident asked me what republicans have ever done to bring minorities out of poverty. I showed her stories about charter school success stories out of Detroit. She read them, thanked me for the info and commented that democrat opposition to charter schools didn't make sense.
In another case, Nancy Pelosi posted some BS about women not making as much as men. I posted info about the 63 equal pay act and the later Equal Rights Amendment to her timeline. That stirred up a crapstorm but the info I posted was undeniable. Last I looked, liberals were asking why nothing was being done if companies were breaking the law and the democrats have control of the department of justice.