They look for agreement. 

We're trained to discuss, to challenge, and to advocate for the devil because exchanging opinions, especially different opinions, is how we separate the wheat from the idea chaff. Automatic agreement doesn't help.

Unfortunately, going contrary is an easy habit to fall into. It's easy to automatically look for points of disagreement rather than agreement. It's easy to automatically take a different side.

And it's easy to end up in what feels like an argument.

Likable people don't actively (or unknowingly) look to disagree; they look for points of agreement. Then, if it's appropriate, they gently share a different point of view — and in that way, they help foster an outstanding conversation.

They (selectively) use the power of touch. 

Nonsexual touch can be incredibly powerful. (I'm aware that sexual touch can be powerful too, thanks.) Touch can influence behavior, increase the chances of compliance, make the person doing the touching seem more attractive and friendly, and can even help you make a sale.

For example, in one experiment the participants tried to convey 12 different emotions by touching another blindfolded participant on the forearm. The rate of accuracy for perceiving emotions like fear, anger, gratitude, sympathy, love, and disgust ranged from 43% to 83% — without a word being spoken.

Say you're congratulating someone; shaking hands or (possibly better yet, depending on the situation) gently patting that person on the shoulder or forearm can help reinforce the sincerity of your words.