When I share something about Bitcoin on Facebook, nobody like that or no comment about that; cause they don't know. But I know in 2 or 3 years people share their ChangeTip links like crazy, talk about discounted prices with Bitcoin, talk about Bitcoin price's dumping/pumping etc. If that days come, Bitcoin price will be more than $10,000 guys, we'll see this I believe!
The fact that you have found this community shows that you probably are smarter than average. Your Facebook friends aren't if they represent a group consisting of average people. If you post something here, even if it isn't about Bitcoin people will understand. For that reason you may have the illusion that your Facebook friends should understand that as well. Even if 50 % of people some day have a Bitcoin wallet that doesn't mean they understand it. They still won't comment when you post about Bitcoin on Facebook.