I guess I'll stick my introverted hand up
and admit that I do something like this with a friend via email, only we touch base every day and don't really refer to it as SMART goals, more our current projects. Basically we send each other a list in the morning of what we would like to have done that day on our personal projects and update our status at the end of the day. It's going to be a nice day today, so mine will probably just be "X hour hike". Also need to review some travel brochures and maps for the upcoming 2 month RV trip, do some writing and scope out a plan for my portfolio cash. And the dreaded cleaning list (cleaning does not come naturally to me).
She's working on her next book and editing another book for someone else so usually has something in her email to do with that. Yesterday was completely focused on watching both the market and Breaking Bad. I over-achieved on that particular project.
We don't do it to be "accountable" to someone else - it's more encouraging each other - but she is good at reminding me to not be such a perfectionist and take every little progress towards stuff like cleaning or anything else really that I avoid doing as a win. I hope I do the same for her.
We've done this together off and on over the last 5 years that I've known her. Used to use idonethis.com which is handy because they send you an email every day or however often you want and keep a record of what you logged in for that day. Maybe it works for us because personally, I am not working right now because I have my own stuff to do, not so much to get away from somewhere - except that their stuff wasn't interesting to me anymore. I'm also not married (but she is). Maybe that makes a difference.
It's not much different than the "What did you do today" thread on here or the Wednesday weigh-in thread or the thread that used to be here for decluttering. Just sharing with people that care about you and want to see you happy.