I have found Facebook to be invaluable for contacting old friends, neighbors, school mates and people I knew before I was a JW.
But, I must warn you:..if you are an ex-Witness trying to contact JWs from years back, it can go one way or the other!.. Some will be glad to hear from you and their human side will wish you well. Others will have the cult ‘loyalty’ thing kick in and you may get a less than friendly answer... I found this amusing, especially with somebody from years back who was hardly seen at meetings...Now, they’re all ‘righteous’🙄.
But, I have had mostly positive responses. Even if the people live in another part of the country and I’m never going to get together, I never regret saying hello and wishing an old acquaintance well, even if they feel they can’t return the sentiment because of the religion. So what?