How can I convince my friend to stop trying to find a boyfriend through facebook?

My friend meets weird guys at fb and starts relationships without having ever met them and after a while she starts dating them in real life.This happened with her first boyfriend who سے طرف کی the way all he wanted was to hook up with her.She told me that he was asking her to have sex before they even met each other!!I think that she knew about all the guys she's met this way that their profiles were real,but it's still really dangerous.Later she met another guy at fb that she liked and wanted to date.They went out a few times but I think they never became a couple.Well yesterday guess what ' she told me that she found a new boyfriend at fb and yesterday she was meeting him in person for the first time.It was my 18th birthday and we went out nd she told me that he'd invited her boyfriend to meet us.My friend didn't even know his name right and when they met after a while he started licking her and french kissing.They kept doing this for a couple of hours.I was not only insulted but also really shocked because this guy was actually a stranger for her.She's not a slut we've been دوستوں for 2-3 years,but she's really desperate for having a boyfriend and finding love and thinks this'll happen سے طرف کی dating random guys she meets online.She's a very nice girl,but she doesn't feel confident to approach a boy she likes and have a normal relationship.I've told her many times that she will never meet a nice guy this way and if she meets some kind of psycho god knows what may happen.How can I help her?