Human beings are relational. We like to be acknowledged. We like too participate and contribute. We like to feel that what we have to say is valuable.
Most of your blog’s readers are human beings (well most of mine are). So acknowledge and interact with them.
The most common way for interaction on blogs is through comments. An an old study I once read found that 43% of blogs use comments – I suspect the figure would be much higher today with most blogging platforms now integrating them (remember the days when you had to use a third party comments system!?).
Not everyone likes comments. Some bigger bloggers don’t use them because they get overwhelmed by too much interaction and some smaller blogs don’t use them because they don’t get any comments at all and are embarrassed with the ‘comments (0)’ at the end of each post. Still others gave up on comments because of comment spam.