You can infer quite a bit about people's unwritten intent. How?

• When a person's cadence changes from their normal cadence when they interact with you - whether slower or faster
• When a person ignores a directed update on their Wall or in their Twitter stream
• When a person does not follow another back or friend them
• How and when someone inserts themselves into a public conversation
• How a person proactively requests connections and on which platforms.
• What and who a person RTs or shares
• How reactive and emotional individuals are (are they quick to judge or slower to respond to good/bad news?)