Subscribe whatever way works best for you.
I recommend the email sign up, even if you also subscribe some other way.
I write a post.
The RSS is automatic.
I usually remember to post a link in twitter.
I try to post a link into google+ and FB. (sometimes I forget, or am a day late.
I will post to LinkedIn for some posts, but not all.
And sometimes I send extra stuff to the mailing list that doesn’t go anywhere else.
For example, I’ll be posting book discounts to the mailing list.