His stream-of-consciousness entry for Thursday was also panned online, with lines such as: "This business is insane. Impressive growth. Unique. Fast paced. There's a lot to love. We'll work well together."
And finally, on Friday, April 13 he wrote: "The week closes, as it always does, with a million and one questions flying around my grey matter."
The original post attracted many comments, with one person asking: "Do you actually possess a soul?" while another asked: "Is this a spoof?" and a third said: "Last thought of the day: w*****"
It was also quickly picked up on social media.
While some Twitter users defended Mr Gallagher's post, saying he was simply "overly enthusiastic" with a "lack of self-awareness" — most people condemned his writing.
Some commentators even compared Mr Gallagher's writing style to that of British spoof character Alan Partridge, a famously clueless TV and radio presenter.
Mr Gallagher has not yet responded to the growing furore on either LinkedIn or Twitter.
- News.com.au