I believe the game condenses similar newsfeed items, e.g. if I 10-0 you, you only get one message saying "You were attacked by BigMoney." Similarly if someone fails 20 robs in a row before punching a successful one through, you'd get one red notification and one green notification. I'm not sure if there is a limit on the number of feeds in a row you can get from one person but the most I've seen is 5 items of green/red/green/red/green.
More on topic, the only reason numerous failed attacks/robs from players a fraction of my strength bothers me is that they are almost guaranteed to be pushing someone more important (time traveler, super high IPH, etc) further down my newsfeed.