don't know what to do....

Received a call from my friend Andrea last night.  She called concerned because of what a friend of hers (who I know but not very well) told her.  My friend's friend, Sue, has a daughter who is very good friends with my son. She alerted her mom to J's FB post. J posted on FB that he is planning on ending his life before August 1st.  
I don't know if this is an older post or not.  He's been out of town this past week and then came back late last night so I haven't had the opportunity to ask him.  Earlier in the month he had texted this same thing to his ex gf.  We talked to him about and later his gf asked him again if he has a specific plan and he said no.  I know I need more information before I talk to J but the people who can help me aren't available right now.  
Although this issue has been bothering me - I've been pretty good about handling it until the phone call last night and then my husband telling me he didn't sleep half the night worrying about J.  
What also concerns me is J quit his part-time job (that he seemed to like and brought in spending money) and he has no plans to go to school this fall either.  No positive plans, that is.......