Research shows that most Facebook users are on mobile, and engagement declines dramatically with longer posts. A rule of thumb, you should aim to write posts that are around ________. Hootsuite Certification 25 April 202025 April 2020StudyBlocksLeave a Comment on Research shows that most Facebook users are on mobile, and engagement declines dramatically with longer posts. A rule of thumb, you should aim to write posts that are around ________.140 characters280 characters50-60 characters480 characters