People, when you are walking in high foot traffic areas put your phones away for two minutes, pick your heads up, and pay attention to your surroundings. I'm sure that tweet will still be there the next time you look at your feed. When you are on your phone you don't see hordes of people coming your way and cause massive clogs or walk into other people. This is especially important when walking into buildings as I am not going to open and hold the door for you just because you don't have any spatial awareness and you are blocking a major chokepoint. Seriously think of someone other than yourself for a minute and ask yourself, "can this wait?" If the answer is yes then put the phone away and watch where you are walking. If the answer is no then ask yourself "should I step to the side to deal with this manner?" The answer to that question is always yes. You look like an idiot when you walk into someone because you cant be bothered to consider other people and put your phone down.