This story is a long one so I'm going to give you the shortened up version here. Basically Courtland accused Kieffer of stalking Jenelle and being jealous etc. So Kieffer posted a message between himself and Jenelle from November. It was her giving him her phone number and saying she needed to talk. (She and Courtland were together at that time.) So that started a huge twitter war between Court and Kieff.
During which Courtland openly admits to Jenelle doing heroin with Kieffer when she was in NJ with him. Remember when that happened? She disappeared to NJ with Kieffer to look for a new place to live and then went to the hospital for a "cyst." (Apparently ruptured cysts are code for heroin.)
Barbara had to fly up to her so that she could drive her home. Apparently she got too "strung out" on heroin and had to go into detox and the hospital in which Kieffer abandoned her. This was revealed in the video that Kieffer's mom recorded while talking to Barbara on the phone.
During the twitter war everything came out into the open for sure. Courtland tells him that he is the one who got her into heroin and that everyone will see on the upcoming season of Teen Mom 2. Which makes me (and probably everyone else) wonder if they will address Jenelle and Kieffer's heroin abuse on the show. It seems almost too hard core for the show but then again they surprised me when they addressed Amber Portwood's drug problems in the final season of Teen Mom.
Another question that comes to my mind is whether or not there will be a fifth season of Teen Mom 2, or if the incident in NJ was during the filming of the fourth season. I'm fairly certain that season 4 had wrapped by that time, but who can keep track really? We'll have to wait and see with that one!
If you want to read the whole twitter war and get more details about this check out: starcasm.net