[xeeeeeeeeeeenu]

As long as you abide by WP:N, WP:NOR and WP:NPOV, writing articles about yourself is perfectly acceptable on Wikipedia and doesn't break the rules.

[oefrha]

You may want to review https://en.wikipedia.org/wiki/Wikipedia:Conflict_of_interest. Acceptable — sure, sometimes. Perfectly — no. It’s a strongly discouraged practice.

[Geimfari]

It's strongly discouraged and looked down upon. Editors with a conflict of interest take up a disproportionate amount of other editors' time and are practically never able to write neutrally about themselves or their company.