It allows people to express their thoughts on a common topic easily.
Allows people to create to-do lists.
It allows companies,restaurants,etc to collect feedback.(b)
In one post, you are only able to type 160 words and if you exceed the limit, it is tiring to create a new post and you may lose your “train of thought”
The wall is too small and if many people paste stickies on the wall, it will be very crowded.(c)
It can be used as an announcement board.