What I am doing is to express myself using Twitter. Plenty of times I noticed that I want to use more characters than allowed and that I need to cut down on my writing. With time I'll allow myself to move on to larger formats.
Sharpening the one-liner skills is definitely worth it. I got on Usenet and my sentence quality went through the roof.
OTOH, my ability to write anything over five coherent paragraphs atrophied and I had to relearn it.
Granted, writing is not very effective. But some of us just love writing...
Earning to Give Writing: Which are the places that pay 1USD or more dollars per word?
Mind Changing Writing: What books need being written that can actually help people effectively change the world?
Clarification Writing: What needs being written because it is only through writing that these ideas will emerge in the first place?
Writing About Efficacy: Maybe nothing else needs to be written on this.
What should we be writing about if we have already been, for very long, training the craft? What has not yet been written, what is the new thing?
The world surely won't save itself through writing, but it surely won't write itself either.