Back in my BBS days, I ran a continuing story board. Something funny where one could knock off a few paragraphs and have fun writing it. Playing in that medium probably helped me more than most. It wasn't just me writing, so sometimes it was a challenge to twist the plot against others to something I wanted. It taught me a lot of phrasing, typing, and general grammar.
Today blogging is good, you just need to get into writing more than posting funny pictures. :-D