I'm pretty sure I have many to recommend but my all time favourite(s) would be Fangirl by Rainbow Rowell and Charlotte Street by Danny Wallace!

For Fangirl, I simply just love the author's creative ways of name picking for the main characters (Cath and Wren = Catherine - they're actually twins so that's a really unique way to name them, in my opinion). I love the art, awesome characters, plot and the fact that there's a whole world of fanfiction and fandoms in it . It's relatable, not to mention it's not your typical average young adult romance, I would say but that's what makes it more appealing and one of the reasons why I love that book :D

For Charlotte Street, it's a really funny read with the author's British humour and sarcasm, it'll make you LOL for real - I know I did! It sorta has a stalking concept but it's only because he wants to return the mysterious girl's disposable camera. But the story goes on for the search of her, and in return he began to realize some things about his life and how he should have long gotten over his ex girlfriend who dumped him for another guy. In a way, he kinda owes it to the mysterious girl for it all.
Despite the word 'stalking', it's actually more than that with a touch of Coincidence, Fate and the 'What If' sorta element. It's a really entertaining literature to read :D