SEO - how to do blog comment?

[Hal Smith]

You can do it but the link juice you get out of this is negligible. It is far more better to post on different sites hosted differently. The effort you'll be inputting this way doesn't justify the outcome. For it counting as spamming, if you still want to do it, do it so that you post intelligent unique comments every time and only to the blogs that are relevant to your site or it might raise a red flag as blog posting is the most commonly known way of spamming, but as said before the return you get really doesn't justify it.

Hal Smith
URLdreamer Consultant