....comment on a thread to say they're placemarking it when all they're doing is taking up valuable space on the thread? 
If I want to get updates about a thread that I'm interested in but don't have anything to comment on it,instead of commenting on it saying that I'm placemarking,I just tick the 'watch this thread' feature that's also a duplicate of the one that is automatically ticked under the thread if you decide to comment on it solely to get updates so that anytime someone comments on it,I get an email telling me there's been a new comment on it so I just have to click the link and I'm brought back to the thread in question 
If would make threads so much quicker to read and they wouldn't fill up as fast and therefore have to have new ones started that people have to start on by saying thanks for starting a new thread and therefore wasting more valuable space and life easier for everyone if people just ticked this box instead of commenting solely to placemark 
So could people please make life easier for everyone by using the 'watch this thread' feature at the top of these instead of commenting that they want to be updated on it? 
P.S -sorry if some users don't have that feature available on their device or the format of mumsnet they're using