Your Grammar Sucks is a series made by Jack Douglass as part of Jacksfilms, and is arguably its biggest series to date. It began with Jack reading YouTube comments containing spelling and grammatical errors, hence the series name, but expanded to Twitter and Facebook as the series progressed.
The series debuted in June 2011 with its first video (currently at 1.7 million hits), and eventually grew on to turn the comments into songs and "special editions" (Rebecca Black, Twilight, Justin Bieber, etc). For its 40th episode the series turned into a sketch comedy compilation of skits, and that style was reused for the 50th episode special. It has also released two "best-of" compilations; the first one debuted in June 2012 at 20 minutes long. The sequel debuted exactly one year later at 27 minutes long.