I have gotten some friend requests from GLers and I think that in most cases it's just a member that wanted to be a more trusted member in the community by being 'friends' with a senior moderator. What they wanted to do with that trust is beyond me, but I only accept said requests when I have had positive interactions with the member.
In some cases they turned out to be an older member back with a new username, and in other cases they were new members that were either very supportive of harm reduction, or perhaps just used to social media sites where having a lot of 'friends' is an important factor to them.