This is a way of expression like ¯\_(ツ)_/¯ and is called "Kaomoji".
It expresses "face" and "emotion" by combining letters and symbols, and Japanese people use this expression as much as emoji.
However, the meaning of "(((( ˙꒳˙ ))))ﾌﾟﾙﾌﾟﾙﾌﾟﾙﾌﾟﾙﾌﾟﾙﾌﾟﾙﾌﾟﾙ" itself is not clearly understood even by the Japanese.
In any case, there is the aspect that they use it because it is fun😂
I get more confused every time. The algia help says: "puru post ぷる"
But then it posts: "(((( ˙꒳˙ ))))ﾌﾟﾙﾌﾟﾙﾌﾟﾙﾌﾟﾙﾌﾟﾙﾌﾟﾙﾌﾟﾙ"
It's somewhat fascinating how much I cannot understand of this at all.
ぷる and ﾌﾟﾙ are both "puru". ぷる is written in Hiragana characters, ﾌﾟﾙ is writtern in Katakana characters.
To complicate things further, ﾌﾟﾙ is written in so-called "half-width characters; 半角文字", which are from fiarly legacy code system to represent Japanese characters on computers (I am not an expert on computer history...). Today, so-called "full-width characters; 全角文字", プル, are usually used. However, since it gives a funnier feeling, half-width kana is used for this kind of play.
Maybe that was not your question...
It was very enlightening, though, except for the part that starts in the beginning and ends at the end.
