identifying a part of speech..

[Unregistered]

Hi, could someone help me out with identifying why this is right:

for example, a sentence like: "my posting in these forums is a new thing"

instead of: "me posting in these forums is a new thing"

I know it's supposed to be "my posting", not "me posting", but what's the justification of using the possessive form or how would I explain this to a native speaker to whom it "sounds right" to say "me posting"?

[Soup]

my (adjective) posting (noun: gerund)
me (object pronoun) posting (present participle)

Gerunds preceded by a genitive
In traditional English grammar, a noun or pronoun preceding a gerund must be genitive (possessive).

Ex: We enjoyed their singing.
Ex: We enjoyed them singing.

It is increasingly common to see the objective used in place of the possessive:

Ex: I do not see it making any difference.
Ex: I do not see its making any difference.

Source Gerund - Wikipedia, the free encyclopedia

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A gerund can be used in combination with either an object or a genitive (possessive). The latter is considered more formal, and the only option when an adjective precedes the gerund, but is more common when the second verb applies to a person rather than an object.

1. We enjoyed them (object pronoun) / their (genitive) singing.
2. I greatly appreciate you / your doing this for me.
3. I greatly appreciate your kind doing this for me. (an object pronoun is not possible here)

Source Gerund - Verb patterns with the gerund