[pestaa]

I do find it weird in English that a noun with -ing ending may possibly remain a noun. In this case blogging.

[wnoise]

"Blog" is a verb as well as a noun. In this case it is just the usual rule of "-ing" taking a verb into its present participle (adjective) or gerund (noun) denoting the action or process of the verb.

[silentOpen]

"blog" is both a noun and a verb. In this case, the verb was used as a gerund (noun).