Since you’ve given enough details to identify yourself, I would go ahead and pull the trigger on the Facebook offer as promptly as possible.
After you leave your current job, people will look at your empty chair for several weeks and shrug. After 3 weeks, there will be someone new sitting there. After 6 weeks, you won’t be mentioned. After 6 months you won’t be remembered. After 6 years, you won’t remember them either.