んだそうだ
kakikonda sōda

Godan Verb (mu)
Evidential Auxiliary

Expresses hearsay about a past event ("I heard that...") of 書き込む

1. It is said that (someone) wrote in/on.; Apparently (someone) wrote in/on.; I heard that (someone) wrote in/on.

Past/Perfective
Hearsay Evidence
Computing