One thing a bit weird about the following people concept, is there is nothing predictable about what they will talk about or how much they will post on any give

One thing a bit weird about the following people concept, is there is nothing predictable about what they will talk about or how much they will post on any give day. I usually follow someone after reading something they wrote about X and then find them talking about about Y or Z for the next N posts. Following keywords/names mentioned in posts maybe more interesting...