[amabaie]

Be opinionated in your post.

Ask a question. The best are this or that questions, because people love to take sides.

Respond back to comments.

DoFollow

Network.

Comment on another blog and invite comments back as a footnote, assuming the blogs are on complementary topics.

BTW, it sounds bad, but seeding the comments is no different than professional speakers planting questions in the audience. Nobody likes to be the first to raise his hand, so speakers sometimes plant the first one or two questions, not to control discussion, but to make the audience feel comfortable.