The phrasal verb are Don't Be a Stranger

Don't Be a Stranger
Meaning/Usage: Commonly used to tell someone to stay in touch
Explanation: This is commonly used when you are talking to someone you don't meet or see often.
Some examples to explain more
1-It was really nice seeing you again. Don't be a stranger.
2-We need to keep in touch. Don't be a stranger.
3-Now that we live so close to one another don't be a stranger.
Conversation about the phrasal verb Don't Be a Stranger
A- Hey John, I don't see you around here these days.
B-I moved down south several months ago.
A-Keep in touch man. Don't be a stranger.
B-Definitely. I'll buzz you every time I come up.

Other Common Sentences
1-Keep in touch.
2-Ping me once in awhile.