Creeps on Facebook & other Social Media?

[sɴøʙʟᴏᴅ]

a man i barely know says he has fallen in love with me just by looking at my facebook pictures, he's double my age and personally i think he's being pathetic but i'm trying to handle the situation politely - normally i ignore all messages like that however this man is a family friend and it would be tremendously rude to ignore it unfortunately

anyway, i figure he's just saying whatever to me hoping i'll fall endlessly in love with him, be his girlfriend or have sex etc - but i've had this kind of creepy attention before and i really have to wonder, is it that easy for you to fall in love? because men i've been in relationships with and guys my age seem to not be so easily swayed... i have no problem with age gaps whatsoever, i've dated a man 11 years my senior - i just mean in general these kind of men i get messages from are usually a lot older than me. men my own age seem rather confident, slightly cocky when approaching girls but i prefer it a lot more compared to pining.

women reading this, do you often get harassed on social media? how do you deal with it politely? and men reading this - do you get harrassed also, by men/women/or both? how do you handle it? what advice can anyone give me?

disclaimer: if you are going to tell me i am abusing my "privilege" as a woman by creep shaming then i really don't want to hear it, such comments are unwelcome here and are not valid answers to my question. thank you!