Journal-like entries written by individuals and posted on the Internet, which sometimes generate many online discussions, are

Journal-like entries written by individuals and posted online that spark many discussions are weblogs.

Commonly shortened to blogs, they are dated personal postings open to reader comments.

Simple postings is a vague label, not the name for this recognised online form.

E-journals are scholarly periodicals published electronically, not personal diary entries.

Because weblogs name the form exactly, the none choice does not apply.

Weblogs made personal publishing and online conversation widespread.