<human>: As a young kid my brother would play with one of our neighbor's sons and I [26 F] ended up doing a small amount of web development work with this guy [55 M] (dad's colleague, only interacted through my dad) when I was a teenager. I'm now living in another country and have been for more than 10 years, and this guy has tried to add me on every social media site that I belong to. At first it didn't bother me, but then he started messaging me intermittently, with no specific clear purpose except trying to catch up. He is twice my age and we have nothing in common except that he was my brother's friend's dad and he worked with my dad.

I have never responded to anything except initially when I added him to LinkedIn. I have since blocked him on every social media site and thought that was the end of it. He seems to have found my google account though, as I just got the following email:

----

I can't find you on LinkedIn anymore?
How are you doing?

Sincerely,

----

I'm starting to get creeped out as he also sent an email years ago to my university account. No one has ever given him my contact info, but he probably was able to find it online through the university website or by guessing.

What should I do? I'm debating sending him a clear email that says something like, 'Hi ----, I have cleaned up my social media accounts to keep in touch only with current connections. Thanks, ----' 

I don't want to be a jerk, but his behavior is pretty inappropriate. He was always 'that creepy guy,' couldn't keep a job, etc... I also don't want to encourage him by responding if that is how he will take that response. Any thoughts are appreciated.

Give me the gist of the text in a nutshell
<bot>: One of old neighbors continues to try to contact me through various channels despite no response from me. Is this behavior dangerous? What should I do?