Grammar, however; is an important factor on an internet site where folks can only read what you say, and will or will not converse with you if the text is really hard/annoying to read.
Sure, but don't let precise grammar get in the way of missing an intelligent and insightful message.
If you can't tolerate some grammatical variation on an online forum then you will be doing yourself a disservice.
Eg. roe made a single post on another thread that was very insightful, and I recognised this and went and read a few hundred of his previous posts on another forum (regarding shares) and gained some valuable insights into his investment approach and long-term investment success - grammar wasn't perfect, but the message is very clear, easy to understand and well worth listening to.