From WordPress to Tumblr, Blogger to Squarespace, writers are using blogs to engage their readers. Aryn Kyle shares anecdotes from her recent West Coast book tour at www.arynkyle.tumblr.com, while on Blogspot, Dedra Johnson meditates about the challenge of immersing herself in a character while dealing with life’s day-to-day details. If part of the literary project is to build connections and invite people in, the willing writer might want to experiment with an emerging form of digital storytelling — the cross-platform mobile app.   Browser bookmarking site Read it Later examined its users’ screen-based reading habits and found that   …of …