These people just seem really impatient and needy. Just because someone reads your text, it doesn’t mean they’re able to respond right away. They might read it but can’t respond and forget to respond later or they might not feel like it needs a response. The thing about posting on Twitter is also ridiculous. I leave my phone on silent, unless I’m out doing something, and I don’t check it every two seconds or even every hour. I guess people forget that you can also be on Facebook or Twitter from your computer or tablet or whatever.