Something I notice is that when I see a text in a language I'm not comfortable with, I need a conscious effort to not skip it and try to translate and/or interpret. Now, wherever there is microblogging, I get the impression Japanese people just love to make small posts, and going by my subs/followed feed this past week, I noticed I was starting to slow down on the posts of the Japanese folks I follow, unconsiously trying to read what's written.
Also though technically not studying it, some Italian posts appear in my feed every now and then, and also been noticing I've been getting more and more comfortable with the language, even being able to interpret a good chunk of the texts. To a smaller extent the same happens to French.