Nearly 750 "shares" and "likes", but only 2 comments…
Here's one that comes from a great blog I follow, Creative Bloq. It's not related to ELT, but the problem you can see them having above is one the vast majority of blogs have nowadays (including this one!): they're getting very few comments.
In language teaching, if you're using a class blog, or something else (an Edmodo group, or Facebook, or whatever), you want lots of comments, as well as the posts. Both should be produced by the learners as often as by the teacher and you want the comments particularly (a) because it suggests the learners are finding the content interesting and (b) because comments provide meaningful opportunities for more interaction and use of the language.
To get such comments, you really have to add a "comments" stage to your task design, and require it of your learners. It's not enough just to "like"!
Apart from what you're doing with your classes, if you're reading blogs (etc.) for the purposes of professional development, you want to write comments. You want to do so because "liking" and then immediately forgetting and moving on to the next thing to "like" really isn't engaging the brain in any meaningful way whatsoever. Actually having to write some sort of response does, as does entering into dialogue. To develop as a teacher — or as anything else — you need to brain to be engaged. "Liking" isn't enough!
If you think you just don't have time to "comment", my advice would be to stop "following" so many people or use something organised like The Old Reader to follow blogs via RSS, rather than wasting your time "liking" stuff on Facebook (etc).
Rant over. Am I starting to sound like a grumpy old man…?