There are tons of online trail journals on both trailjournals.com and postholer.com. There is really no need to go looking further! Most of the ones I've read have been written from day-to-day and uploaded whenever the hiker has cell phone reception.

If you're looking at long distance trails only, please note that they are well-populated these days, so you will not find much social isolation! In fact, the best known of these trails now have the reputation of being "party trails"!

There's also the issue that a hiker trying to cover many miles per day in order to complete a long trail before the snow flies has very little time or energy for detailed journal entries.