I can only wonder what Yozora ever did on message boards in the past. It must not have been pretty if she didn't want to talk about it. I laughed when Sena said they were calling her a troll on there too. Welcome to the internet sister.
I can relate to this episode pretty well, cause while I have a cellphone, I never use it. Not to mention it's a pretty old one. It's a little depressing to think about but eh...it's not a big deal.
I thought it was a cute gesture that Sena ended up buying the exact same model and color of phone that Kodaka had, not to mention running straight to him for help after Yozora's little prank. I can see the affection in the air there and it seems Yozora notices it too.
Again, not a bad episode. A few facepalm moments mostly brought to me from Rika, but nothing downright horrid.
On a totally unrelated note, Sena's chest seemed a little more sentient than usual in this episode. 